cc: Adding support for RGBA_4444 tile textures

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 3d1ce0be9867c876356d931dbf169aaddcef0005..68fc0e95894cd76dd4c2b1faad49d0d016e89a25 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -103,6 +103,14 @@ inline ManagedTileBin BinFromTilePriority(const TilePriority& prio,
 // of time scheduling one enormous set of tasks.
 const size_t kMaxRasterTasks = 256u;
 
+// static
+cc::ResourceProvider::Format GetTextureFormat(
+    cc::ResourceProvider* provider,
+    bool use_rgba_4444_tiles) {
+  return use_rgba_4444_tiles ? cc::ResourceProvider::RGBA_4444 :
+      provider->best_texture_format();
+}
+
 }  // namespace
 
 RasterTaskCompletionStats::RasterTaskCompletionStats()
@@ -125,7 +133,8 @@ scoped_ptr<TileManager> TileManager::Create(
     size_t num_raster_threads,
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     bool use_map_image,
-    size_t max_transfer_buffer_usage_bytes) {
+    size_t max_transfer_buffer_usage_bytes,
+    bool use_rgba_4444_tiles) {
   return make_scoped_ptr(
       new TileManager(client,
                       resource_provider,
@@ -135,7 +144,9 @@ scoped_ptr<TileManager> TileManager::Create(
                       PixelBufferRasterWorkerPool::Create(
                           resource_provider,
                           num_raster_threads,
-                          max_transfer_buffer_usage_bytes),
+                          max_transfer_buffer_usage_bytes,
+                          GetTextureFormat(resource_provider,
+                                           use_rgba_4444_tiles)),
                       num_raster_threads,
                       rendering_stats_instrumentation));
 }