Add automatic Drawable mirroring capability when in RTL layout direction

- default value is "no mirroring"
- introduce android:autoMirrored as a new attribute for Drawable,
BitmapDrawable, LayerDrawable, StateListDrawable and NinePatchDrawable
- setting android:autoMirrored="true" means that the drawable will
be mirrored when the layout direction is RTL (right-to-left)
- also fix an issue with ImageView drawable layout direction not
updated correctly when RTL properties were changed

See bug #7034321 Need Drawable RTL support

Change-Id: If595ee5106c786f38e786d3a032e182f784a9d97

graphics/java/android/graphics/drawable/DrawableContainer.java

@@ -172,6 +172,19 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
         return mDrawableContainerState.isStateful();
     }
 
+    @Override
+    public void setAutoMirrored(boolean mirrored) {
+        mDrawableContainerState.mAutoMirrored = mirrored;
+        if (mCurrDrawable != null) {
+            mCurrDrawable.mutate().setAutoMirrored(mDrawableContainerState.mAutoMirrored);
+        }
+    }
+
+    @Override
+    public boolean isAutoMirrored() {
+        return mDrawableContainerState.mAutoMirrored;
+    }
+
     @Override
     public void jumpToCurrentState() {
         boolean changed = false;
@@ -334,6 +347,7 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
                 d.setLevel(getLevel());
                 d.setBounds(getBounds());
                 d.setLayoutDirection(getLayoutDirection());
+                d.setAutoMirrored(mDrawableContainerState.mAutoMirrored);
             }
         } else {
             mCurrDrawable = null;
@@ -471,6 +485,8 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
         int mEnterFadeDuration;
         int mExitFadeDuration;
 
+        boolean mAutoMirrored;
+
         DrawableContainerState(DrawableContainerState orig, DrawableContainer owner,
                 Resources res) {
             mOwner = owner;
@@ -490,6 +506,7 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
                 mLayoutDirection = orig.mLayoutDirection;
                 mEnterFadeDuration = orig.mEnterFadeDuration;
                 mExitFadeDuration = orig.mExitFadeDuration;
+                mAutoMirrored = orig.mAutoMirrored;
 
                 // Cloning the following values may require creating futures.
                 mConstantPadding = orig.getConstantPadding();