Remove title resources when they are no longer used

ui/android/java/src/org/chromium/ui/resources/ResourceManager.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.ui.resources;
 
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Rect;
@@ skipping 149 matching lines @@
         }
 
         Rect padding = resource.getPadding();
         Rect aperture = resource.getAperture();
 
         nativeOnResourceReady(mNativeResourceManagerPtr, resType, resId, resource.getBitmap(),
                 padding.left, padding.top, padding.right, padding.bottom,
                 aperture.left, aperture.top, aperture.right, aperture.bottom);
     }
 
+    @Override
+    public void onResourceUnregistered(int resType, int resId) {
+        // Only remove dynamic bitmaps that were unregistered.
+        if (resType != AndroidResourceType.DYNAMIC_BITMAP) return;
+
+        nativeRemoveResource(mNativeResourceManagerPtr, resType, resId);
+    }
+
     /**
      * Clear the cache of tinted assets that the native manager holds.
      */
     public void clearTintedResourceCache() {
         if (mNativeResourceManagerPtr == 0) return;
         nativeClearTintedResourceCache(mNativeResourceManagerPtr);
     }
 
     private void saveMetadataForLoadedResource(int resType, int resId, Resource resource) {
         SparseArray<LayoutResource> bucket = mLoadedResources.get(resType);
@@ skipping 47 matching lines @@
 
     private native void nativeOnResourceReady(long nativeResourceManagerImpl, int resType,
             int resId, Bitmap bitmap, int paddingLeft, int paddingTop, int paddingRight,
             int paddingBottom, int apertureLeft, int apertureTop, int apertureRight,
             int apertureBottom);
     private native void nativeOnCrushedSpriteResourceReady(long nativeResourceManagerImpl,
             int bitmapResId, Bitmap bitmap, int[][] frameRects, int unscaledSpriteWidth,
             int unscaledSpriteHeight, float scaledSpriteWidth, float scaledSpriteHeight);
     private native void nativeOnCrushedSpriteResourceReloaded(long nativeResourceManagerImpl,
             int bitmapResId, Bitmap bitmap);
+    private native void nativeRemoveResource(long nativeResourceManagerImpl, int resType,
+            int resId);
     private native void nativeClearTintedResourceCache(long nativeResourceManagerImpl);
 
 }