cc: Adding support for RGBA_4444 tile textures

cc/output/gl_renderer.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/output/gl_renderer.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 1686 matching lines @@
         GL_TEXTURE_POOL_UNMANAGED_CHROMIUM,
         ResourceProvider::TextureUsageAny);
   }
 
   SkBitmapDevice device(on_demand_tile_raster_bitmap_);
   SkCanvas canvas(&device);
 
   quad->picture_pile->RasterToBitmap(&canvas, quad->content_rect,
                                      quad->contents_scale, NULL);
 
+  const uint8_t* bitmap_pixels = NULL;
+  if (resource_provider_->best_texture_type() == ResourceProvider::RGBA_4444) {
+    on_demand_tile_raster_bitmap_.copyTo(
+        &on_demand_tile_raster_bitmap_4444_, SkBitmap::kARGB_4444_Config);
+    bitmap_pixels = reinterpret_cast<uint8_t*>(
+        on_demand_tile_raster_bitmap_4444_.getPixels());
+  } else {
+    bitmap_pixels = reinterpret_cast<uint8_t*>(
+        on_demand_tile_raster_bitmap_.getPixels());
+  }
+
   resource_provider_->SetPixels(
       on_demand_tile_raster_resource_id_,
-      reinterpret_cast<uint8_t*>(on_demand_tile_raster_bitmap_.getPixels()),
+      bitmap_pixels,
       gfx::Rect(quad->texture_size),
       gfx::Rect(quad->texture_size),
       gfx::Vector2d());
 
   DrawContentQuad(frame, quad, on_demand_tile_raster_resource_id_);
 }
 
 struct TextureProgramBinding {
   template <class Program>
   void Set(Program* program, WebKit::WebGraphicsContext3D* context) {
@@ skipping 1430 matching lines @@
   std::string unique_context_name = base::StringPrintf(
       "%s-Offscreen-%p",
       Settings().compositor_name.c_str(),
       context_);
   offscreen_context_provider->Context3d()->pushGroupMarkerEXT(
       unique_context_name.c_str());
 }
 
 
 }  // namespace cc