Adapt ActionBar.LayoutParams to Toolbar.LayoutParams on demand

When Toolbar is acting in the role of an action bar it needs to handle
the case where app code calls setLayoutParams on a custom view with an
ActionBar.LayoutParams instance. Run the newly set LayoutParams
through the check/generate routine normally performed when adding a
child view whenever LayoutParams are set on an existing child to
correct for it.

This might not be a bad thing to generalize someday but it would make
for very confusing compatibility behavior when running code that
was written to expect it on older platform versions.

Bug 16219488

Change-Id: I568a335fe8ebbbaa666690d1f0e95f313abd2f1e

core/java/android/widget/Toolbar.java

@@ -1006,6 +1006,24 @@ public class Toolbar extends ViewGroup {
         super.onRestoreInstanceState(ss.getSuperState());
     }
 
+    /**
+     * @hide
+     */
+    @Override
+    protected void onSetLayoutParams(View child, ViewGroup.LayoutParams lp) {
+        /*
+         * Apps may set ActionBar.LayoutParams on their action bar custom views when
+         * a Toolbar is actually acting in the role of the action bar. Perform a quick
+         * switch with Toolbar.LayoutParams whenever this happens. This does leave open
+         * one potential gotcha: if an app retains the ActionBar.LayoutParams reference
+         * and attempts to keep making changes to it before layout those changes won't
+         * be reflected in the final results.
+         */
+        if (!checkLayoutParams(lp)) {
+            child.setLayoutParams(generateLayoutParams(lp));
+        }
+    }
+
     private void measureChildConstrained(View child, int parentWidthSpec, int widthUsed,
             int parentHeightSpec, int heightUsed, int heightConstraint) {
         final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();