cc: Add strict layer property change checking and handle bounds changes during paint.

cc/layers/tiled_layer.cc

 // Copyright 2011 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.
 
 #include "cc/layers/tiled_layer.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/auto_reset.h"
@@ skipping 452 matching lines @@
                                     int left,
                                     int top,
                                     int right,
                                     int bottom,
                                     ResourceUpdateQueue* queue,
                                     const OcclusionTracker* occlusion,
                                     RenderingStats* stats) {
   // The update_rect should be in layer space. So we have to convert the
   // paint_rect from content space to layer space.
   float width_scale =
-      bounds().width() / static_cast<float>(content_bounds().width());
+      paint_properties().bounds.width() /
+      static_cast<float>(content_bounds().width());
   float height_scale =
-      bounds().height() / static_cast<float>(content_bounds().height());
+      paint_properties().bounds.height() /
+      static_cast<float>(content_bounds().height());
   update_rect_ = gfx::ScaleRect(paint_rect, width_scale, height_scale);
 
   // Calling PrepareToUpdate() calls into WebKit to paint, which may have the
   // side effect of disabling compositing, which causes our reference to the
   // texture updater to be deleted.  However, we can't free the memory backing
   // the SkCanvas until the paint finishes, so we grab a local reference here to
   // hold the updater alive until the paint completes.
   scoped_refptr<LayerUpdater> protector(Updater());
   gfx::Rect painted_opaque_rect;
   Updater()->PrepareToUpdate(paint_rect,
@@ skipping 396 matching lines @@
   gfx::Rect prepaint_rect = visible_content_rect();
   prepaint_rect.Inset(-tiler_->tile_size().width() * kPrepaintColumns,
                       -tiler_->tile_size().height() * kPrepaintRows);
   gfx::Rect content_rect(content_bounds());
   prepaint_rect.Intersect(content_rect);
 
   return prepaint_rect;
 }
 
 }  // namespace cc