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..7cf653861246ceda577b324ca339a3bd6dc21ae9 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -125,7 +125,8 @@ 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,
@@ -137,7 +138,10 @@ scoped_ptr<TileManager> TileManager::Create(
                           num_raster_threads,
                           max_transfer_buffer_usage_bytes),
                       num_raster_threads,
-                      rendering_stats_instrumentation));
+                      rendering_stats_instrumentation,
+                      use_rgba_4444_tiles ?
+                      ResourceProvider::RGBA_4444 :
+                      ResourceProvider::RGBA_8888));
 }
 
 TileManager::TileManager(
@@ -145,7 +149,8 @@ TileManager::TileManager(
     ResourceProvider* resource_provider,
     scoped_ptr<RasterWorkerPool> raster_worker_pool,
     size_t num_raster_threads,
-    RenderingStatsInstrumentation* rendering_stats_instrumentation)
+    RenderingStatsInstrumentation* rendering_stats_instrumentation,
+    ResourceProvider::TextureType texture_type)
     : client_(client),
       resource_pool_(ResourcePool::Create(resource_provider)),
       raster_worker_pool_(raster_worker_pool.Pass()),
@@ -156,7 +161,8 @@ TileManager::TileManager(
       resources_releasable_(0),
       ever_exceeded_memory_budget_(false),
       rendering_stats_instrumentation_(rendering_stats_instrumentation),
-      did_initialize_visible_tile_(false) {
+      did_initialize_visible_tile_(false),
+      texture_type_(texture_type) {
   raster_worker_pool_->SetClient(this);
 }
 
@@ -721,7 +727,9 @@ RasterWorkerPool::RasterTask TileManager::CreateRasterTask(Tile* tile) {
   scoped_ptr<ResourcePool::Resource> resource =
       resource_pool_->AcquireResource(
           tile->tile_size_.size(),
-          raster_worker_pool_->GetResourceFormat());
+          raster_worker_pool_->GetResourceFormat(),
+          texture_type_);
+
   const Resource* const_resource = resource.get();
 
   // Create and queue all image decode tasks that this tile depends on.
@@ -765,7 +773,8 @@ RasterWorkerPool::RasterTask TileManager::CreateRasterTask(Tile* tile) {
                  tile->id(),
                  base::Passed(&resource),
                  mts.raster_mode),
-      &decode_tasks);
+      &decode_tasks,
+      texture_type_);
 }
 
 void TileManager::OnImageDecodeTaskCompleted(