Support different formats in the same resource pool.

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 dff3a52f871ac6a80cd05b77e92fc25ab6b14fed..28c3513f3615519743ed73b197ee0be4b9eb5604 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -622,7 +622,8 @@ void TileManager::AssignGpuMemoryToTiles(
     MemoryUsage memory_required_by_tile_to_be_scheduled;
     if (!tile->raster_task_.get()) {
       memory_required_by_tile_to_be_scheduled = MemoryUsage::FromConfig(
-          tile->desired_texture_size(), resource_pool_->resource_format());
+          tile->desired_texture_size(),
+          resource_pool_->resource_format(DetermineResourceFormatUsage(tile)));
     }
 
     bool tile_is_needed_now = priority.priority_bin == TilePriority::NOW;
@@ -676,6 +677,18 @@ void TileManager::AssignGpuMemoryToTiles(
                    had_enough_memory_to_schedule_tiles_needed_now);
 }
 
+ResourceFormatUsage TileManager::DetermineResourceFormatUsage(
+    const Tile* tile) const {
+  ResourceFormatUsage usage;
+  gfx::Size size = tile->desired_texture_size();
+  if ((size.width() % 4 != 0) || (size.height() % 4 != 0)) {
+    usage = FORMAT_USAGE_NATIVE;
+  } else {
+    usage = tile->IsOpaque() ? FORMAT_USAGE_OPAQUE : FORMAT_USAGE_TRANSLUSCENT;
+  }
+  return usage;
+}
+
 void TileManager::FreeResourcesForTile(Tile* tile) {
   TileDrawInfo& draw_info = tile->draw_info();
   if (draw_info.resource_)
@@ -756,7 +769,8 @@ scoped_refptr<ImageDecodeTask> TileManager::CreateImageDecodeTask(
 
 scoped_refptr<RasterTask> TileManager::CreateRasterTask(Tile* tile) {
   scoped_ptr<ScopedResource> resource =
-      resource_pool_->AcquireResource(tile->desired_texture_size());
+      resource_pool_->AcquireResource(tile->desired_texture_size(),
+                                      DetermineResourceFormatUsage(tile));
   const ScopedResource* const_resource = resource.get();
 
   // Create and queue all image decode tasks that this tile depends on.