cc: Adding support for RGBA_4444 tile textures

cc/layers/image_layer.cc

 // Copyright 2010 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/image_layer.h"
 
 #include "base/compiler_specific.h"
 #include "cc/resources/image_layer_updater.h"
 #include "cc/resources/layer_updater.h"
 #include "cc/resources/prioritized_resource.h"
@@ skipping 38 matching lines @@
     InvalidateContentRect(gfx::Rect(content_bounds()));
   }
   return TiledLayer::Update(queue, occlusion);
 }
 
 void ImageLayer::CreateUpdaterIfNeeded() {
   if (updater_.get())
     return;
 
   updater_ = ImageLayerUpdater::Create();
-  GLenum texture_format =
-      layer_tree_host()->GetRendererCapabilities().best_texture_format;
-  SetTextureFormat(texture_format);
+  SetTextureFormat(
+      layer_tree_host()->GetRendererCapabilities().best_texture_format);
 }
 
 LayerUpdater* ImageLayer::Updater() const {
   return updater_.get();
 }
 
 void ImageLayer::CalculateContentsScale(float ideal_contents_scale,
                                         float device_scale_factor,
                                         float page_scale_factor,
                                         bool animating_transform_to_screen,
@@ skipping 15 matching lines @@
   return static_cast<float>(bitmap_.width()) / bounds().width();
 }
 
 float ImageLayer::ImageContentsScaleY() const {
   if (bounds().IsEmpty() || bitmap_.height() == 0)
     return 1;
   return static_cast<float>(bitmap_.height()) / bounds().height();
 }
 
 }  // namespace cc