Improve (ViewAnchored)TextBubble logic

chrome/android/java/src/org/chromium/chrome/browser/widget/textbubble/ArrowBubbleDrawable.java

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/textbubble/ArrowBubbleDrawable.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/textbubble/ArrowBubbleDrawable.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/textbubble/ArrowBubbleDrawable.java
index 49f50d0e29303181ac7291d8e9caca9e1a9d9c44..3bef42422b5b0a6d33c6cd0d1ee7fae574fa5db8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/widget/textbubble/ArrowBubbleDrawable.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/textbubble/ArrowBubbleDrawable.java
@@ -22,7 +22,7 @@ import org.chromium.chrome.R;
 /**
  * A {@link Drawable} that is a bubble with an arrow pointing out of either the top or bottom.
  */
-class ArrowBubbleDrawable extends Drawable {
+class ArrowBubbleDrawable extends Drawable implements Drawable.Callback {
     private final Rect mCachedBubblePadding = new Rect();
 
     private final int mRadiusPx;
@@ -40,6 +40,9 @@ class ArrowBubbleDrawable extends Drawable {
                         null, null));
         mArrowDrawable = (BitmapDrawable) ApiCompatibilityUtils.getDrawable(
                 context.getResources(), R.drawable.bubble_point_white);
+
+        mBubbleDrawable.setCallback(this);
+        mArrowDrawable.setCallback(this);
     }
 
     /**
@@ -72,6 +75,13 @@ class ArrowBubbleDrawable extends Drawable {
     }
 
     /**
+     * @return Whether or not the arrow is currently drawing on top of this {@link Drawable}.
+     */
+    public boolean isArrowOnTop() {
+        return mArrowOnTop;
+    }
+
+    /**
      * @param color The color to make the bubble and arrow.
      */
     public void setBubbleColor(@ColorInt int color) {
@@ -80,6 +90,22 @@ class ArrowBubbleDrawable extends Drawable {
         invalidateSelf();
     }
 
+    // Drawable.Callback implementation.
+    @Override
+    public void invalidateDrawable(Drawable who) {
+        invalidateSelf();
+    }
+
+    @Override
+    public void scheduleDrawable(Drawable who, Runnable what, long when) {
+        scheduleSelf(what, when);
+    }
+
+    @Override
+    public void unscheduleDrawable(Drawable who, Runnable what) {
+        unscheduleSelf(what);
+    }
+
     // Drawable implementation.
     @Override
     public void draw(Canvas canvas) {