diff --git a/api/current.txt b/api/current.txt
index 998c8051db77a..653e25a91f759 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -2477,6 +2477,11 @@ package android.animation {
     method public void setPropertyName(java.lang.String);
   }
 
+  public class RectEvaluator implements android.animation.TypeEvaluator {
+    ctor public RectEvaluator();
+    method public android.graphics.Rect evaluate(float, android.graphics.Rect, android.graphics.Rect);
+  }
+
   public class TimeAnimator extends android.animation.ValueAnimator {
     ctor public TimeAnimator();
     method public void setTimeListener(android.animation.TimeAnimator.TimeListener);
diff --git a/core/java/android/animation/RectEvaluator.java b/core/java/android/animation/RectEvaluator.java
new file mode 100644
index 0000000000000..10932bbddf078
--- /dev/null
+++ b/core/java/android/animation/RectEvaluator.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.animation;
+
+import android.graphics.Rect;
+
+/**
+ * This evaluator can be used to perform type interpolation between <code>int</code> values.
+ */
+public class RectEvaluator implements TypeEvaluator<Rect> {
+
+    /**
+     * This function returns the result of linearly interpolating the start and
+     * end Rect values, with <code>fraction</code> representing the proportion
+     * between the start and end values. The calculation is a simple parametric
+     * calculation on each of the separate components in the Rect objects
+     * (left, top, right, and bottom).
+     *
+     * @param fraction   The fraction from the starting to the ending values
+     * @param startValue The start Rect
+     * @param endValue   The end Rect
+     * @return A linear interpolation between the start and end values, given the
+     *         <code>fraction</code> parameter.
+     */
+    @Override
+    public Rect evaluate(float fraction, Rect startValue, Rect endValue) {
+        return new Rect(startValue.left + (int)((endValue.left - startValue.left) * fraction),
+                startValue.top + (int)((endValue.top - startValue.top) * fraction),
+                startValue.right + (int)((endValue.right - startValue.right) * fraction),
+                startValue.bottom + (int)((endValue.bottom - startValue.bottom) * fraction));
+    }
+}
diff --git a/core/java/android/view/ViewGroup.java b/core/java/android/view/ViewGroup.java
index 725502dbbdb1c..f615e1bcf48ff 100644
--- a/core/java/android/view/ViewGroup.java
+++ b/core/java/android/view/ViewGroup.java
@@ -406,11 +406,17 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
     private View[] mChildren;
     // Number of valid children in the mChildren array, the rest should be null or not
     // considered as children
-
-    private boolean mLayoutSuppressed = false;
-
     private int mChildrenCount;
 
+    // Whether layout calls are currently being suppressed, controlled by calls to
+    // suppressLayout()
+    boolean mSuppressLayout = false;
+
+    // Whether any layout calls have actually been suppressed while mSuppressLayout
+    // has been true. This tracks whether we need to issue a requestLayout() when
+    // layout is later re-enabled.
+    private boolean mLayoutCalledWhileSuppressed = false;
+
     private static final int ARRAY_INITIAL_CAPACITY = 12;
     private static final int ARRAY_CAPACITY_INCREMENT = 12;
 
@@ -2564,7 +2570,7 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
         exitHoverTargets();
 
         // In case view is detached while transition is running
-        mLayoutSuppressed = false;
+        mLayoutCalledWhileSuppressed = false;
 
         // Tear down our drag tracking
         mDragNotifiedChildren = null;
@@ -4525,7 +4531,7 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
             super.layout(l, t, r, b);
         } else {
             // record the fact that we noop'd it; request layout when transition finishes
-            mLayoutSuppressed = true;
+            mLayoutCalledWhileSuppressed = true;
         }
     }
 
@@ -5201,9 +5207,9 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
         @Override
         public void endTransition(LayoutTransition transition, ViewGroup container,
                 View view, int transitionType) {
-            if (mLayoutSuppressed && !transition.isChangingLayout()) {
+            if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) {
                 requestLayout();
-                mLayoutSuppressed = false;
+                mLayoutCalledWhileSuppressed = false;
             }
             if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) {
                 endViewTransition(view);
@@ -5211,6 +5217,24 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
         }
     };
 
+    /**
+     * Tells this ViewGroup to suppress all layout() calls until layout
+     * suppression is disabled with a later call to suppressLayout(false).
+     * When layout suppression is disabled, a requestLayout() call is sent
+     * if layout() was attempted while layout was being suppressed.
+     *
+     * @hide
+     */
+    public void suppressLayout(boolean suppress) {
+        mSuppressLayout = suppress;
+        if (!suppress) {
+            if (mLayoutCalledWhileSuppressed) {
+                requestLayout();
+                mLayoutCalledWhileSuppressed = false;
+            }
+        }
+    }
+
     /**
      * {@inheritDoc}
      */