cc: Adding support for RGBA_4444 tile textures

cc/resources/tile_manager.cc

 // Copyright 2012 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/tile_manager.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
@@ skipping 132 matching lines @@
     GLenum texture_format)
     : client_(client),
       resource_pool_(ResourcePool::Create(resource_provider)),
       raster_worker_pool_(raster_worker_pool.Pass()),
       all_tiles_that_need_to_be_rasterized_have_memory_(true),
       all_tiles_required_for_activation_have_memory_(true),
       all_tiles_required_for_activation_have_been_initialized_(true),
       ever_exceeded_memory_budget_(false),
       rendering_stats_instrumentation_(rendering_stats_instrumentation),
       did_initialize_visible_tile_(false),
-      texture_format_(texture_format) {
+      texture_format_(texture_format),
+      use_16bit_tiles_(resource_provider->use_16bit_textures()) {
   raster_worker_pool_->SetClient(this);
 }
 
 TileManager::~TileManager() {
   // Reset global state and manage. This should cause
   // our memory usage to drop to zero.
   global_state_ = GlobalStateThatImpactsTilePriority();
 
   // Clear |prioritized_tiles_| so that tiles kept alive by it can be freed.
   prioritized_tiles_.Clear();
@@ skipping 596 matching lines @@
       mts.resolution,
       tile->layer_id(),
       static_cast<const void *>(tile),
       tile->source_frame_number(),
       rendering_stats_instrumentation_,
       base::Bind(&TileManager::OnRasterTaskCompleted,
                  base::Unretained(this),
                  tile->id(),
                  base::Passed(&resource),
                  mts.raster_mode),
-      &decode_tasks);
+      &decode_tasks,
+      use_16bit_tiles_);
 }
 
 void TileManager::OnImageDecodeTaskCompleted(
     int layer_id,
     skia::LazyPixelRef* pixel_ref,
     bool was_canceled) {
   // If the task was canceled, we need to clean it up
   // from |image_decode_tasks_|.
   if (!was_canceled)
     return;
@@ skipping 48 matching lines @@
     tile_version.set_use_resource();
     tile_version.resource_ = resource.Pass();
   }
 
   FreeUnusedResourcesForTile(tile);
   if (tile->priority(ACTIVE_TREE).distance_to_visible_in_pixels == 0)
     did_initialize_visible_tile_ = true;
 }
 
 }  // namespace cc