Fix bad scaling in TiledLayer

cc/resources/bitmap_content_layer_updater.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/resources/bitmap_content_layer_updater.h"
 
 #include "cc/debug/devtools_instrumentation.h"
 #include "cc/debug/rendering_stats_instrumentation.h"
 #include "cc/resources/layer_painter.h"
 #include "cc/resources/prioritized_resource.h"
@@ skipping 36 matching lines @@
     : ContentLayerUpdater(painter.Pass(), stats_instrumentation, layer_id) {}
 
 BitmapContentLayerUpdater::~BitmapContentLayerUpdater() {}
 
 scoped_ptr<LayerUpdater::Resource> BitmapContentLayerUpdater::CreateResource(
     PrioritizedResourceManager* manager) {
   return scoped_ptr<LayerUpdater::Resource>(
       new Resource(this, PrioritizedResource::Create(manager)));
 }
 
-void BitmapContentLayerUpdater::PrepareToUpdate(const gfx::Rect& content_rect,
+void BitmapContentLayerUpdater::PrepareToUpdate(const gfx::Size& content_size,
+                                                const gfx::Rect& paint_rect,
                                                 const gfx::Size& tile_size,
                                                 float contents_width_scale,
                                                 float contents_height_scale) {
-  if (canvas_size_ != content_rect.size()) {
+  if (canvas_size_ != paint_rect.size()) {
     devtools_instrumentation::ScopedLayerTask paint_setup(
         devtools_instrumentation::kPaintSetup, layer_id_);
-    canvas_size_ = content_rect.size();
+    canvas_size_ = paint_rect.size();
     bitmap_backing_.allocN32Pixels(
         canvas_size_.width(), canvas_size_.height(), layer_is_opaque_);
     // TODO(danak): Remove when skia does the check for us: crbug.com/360384
     canvas_ = skia::AdoptRef(new SkCanvas(bitmap_backing_));
-    DCHECK_EQ(content_rect.width(), canvas_->getBaseLayerSize().width());
-    DCHECK_EQ(content_rect.height(), canvas_->getBaseLayerSize().height());
+    DCHECK_EQ(paint_rect.width(), canvas_->getBaseLayerSize().width());
+    DCHECK_EQ(paint_rect.height(), canvas_->getBaseLayerSize().height());
   }
 
   base::TimeTicks start_time =
       rendering_stats_instrumentation_->StartRecording();
-  PaintContents(
-      canvas_.get(), content_rect, contents_width_scale, contents_height_scale);
+  PaintContents(canvas_.get(),
+                content_size,
+                paint_rect,
+                contents_width_scale,
+                contents_height_scale);
   base::TimeDelta duration =
       rendering_stats_instrumentation_->EndRecording(start_time);
   rendering_stats_instrumentation_->AddPaint(
-      duration,
-      content_rect.width() * content_rect.height());
+      duration, paint_rect.width() * paint_rect.height());
 }
 
 void BitmapContentLayerUpdater::UpdateTexture(ResourceUpdateQueue* queue,
                                               PrioritizedResource* texture,
                                               const gfx::Rect& source_rect,
                                               const gfx::Vector2d& dest_offset,
                                               bool partial_update) {
   CHECK(canvas_);
-  ResourceUpdate upload = ResourceUpdate::Create(texture,
-                                                 &bitmap_backing_,
-                                                 content_rect(),
-                                                 source_rect,
-                                                 dest_offset);
+  ResourceUpdate upload = ResourceUpdate::Create(
+      texture, &bitmap_backing_, paint_rect(), source_rect, dest_offset);
   if (partial_update)
     queue->AppendPartialUpload(upload);
   else
     queue->AppendFullUpload(upload);
 }
 
 void BitmapContentLayerUpdater::ReduceMemoryUsage() {
   canvas_.clear();
   canvas_size_ = gfx::Size();
 }
 
 void BitmapContentLayerUpdater::SetOpaque(bool opaque) {
   if (opaque != layer_is_opaque_) {
     canvas_.clear();
     canvas_size_ = gfx::Size();
   }
 
   ContentLayerUpdater::SetOpaque(opaque);
 }
 
 }  // namespace cc