Add an O-release targetAPI check for Canvas.setBitmap.

For apps targeting releases earlier than O setBitmap will attempt
to preserve the matrix from the previous bitmap.  It does not however
attempt to reconstruct the save/restore stack or the clip.

Test: manual test of messenger app referenced in the bug
Bug: 37589964
Change-Id: I67f0928a3f84a8be41da38ef1868e79bdeb03e46

core/java/android/view/View.java

@@ -4462,6 +4462,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
             sIgnoreMeasureCache = targetSdkVersion < Build.VERSION_CODES.KITKAT;
 
             Canvas.sCompatibilityRestore = targetSdkVersion < Build.VERSION_CODES.M;
+            Canvas.sCompatibilitySetBitmap = targetSdkVersion < Build.VERSION_CODES.O;
 
             // In M and newer, our widgets can pass a "hint" value in the size
             // for UNSPECIFIED MeasureSpecs. This lets child views of scrolling containers

graphics/java/android/graphics/Canvas.java

@@ -49,6 +49,8 @@ import javax.microedition.khronos.opengles.GL;
 public class Canvas extends BaseCanvas {
     /** @hide */
     public static boolean sCompatibilityRestore = false;
+    /** @hide */
+    public static boolean sCompatibilitySetBitmap = false;
 
     /** @hide */
     public long getNativeCanvasWrapper() {
@@ -172,6 +174,11 @@ public class Canvas extends BaseCanvas {
             throw new RuntimeException("Can't set a bitmap device on a HW accelerated canvas");
         }
 
+        Matrix preservedMatrix = null;
+        if (bitmap != null && sCompatibilitySetBitmap) {
+            preservedMatrix = getMatrix();
+        }
+
         if (bitmap == null) {
             nSetBitmap(mNativeCanvasWrapper, null);
             mDensity = Bitmap.DENSITY_NONE;
@@ -185,6 +192,10 @@ public class Canvas extends BaseCanvas {
             mDensity = bitmap.mDensity;
         }
 
+        if (preservedMatrix != null) {
+            setMatrix(preservedMatrix);
+        }
+
         mBitmap = bitmap;
     }