Support different formats in the same resource pool.

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 3a8d2e0f9ec0325ae56e64de274f6caa3ac073a9..7beaa20b2a241677e6aed6677262ce237dac9b3d 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -95,9 +95,8 @@ class CC_EXPORT ResourceProvider {
   void DidLoseOutputSurface() { lost_output_surface_ = true; }
 
   int max_texture_size() const { return max_texture_size_; }
-  ResourceFormat memory_efficient_texture_format() const {
-    return use_rgba_4444_texture_format_ ? RGBA_4444 : best_texture_format_;
-  }
+  ResourceFormat memory_efficient_texture_format(
+      ResourceFormatUsage usage) const;
   ResourceFormat best_texture_format() const { return best_texture_format_; }
   ResourceFormat yuv_resource_format() const { return yuv_resource_format_; }
   bool use_sync_query() const { return use_sync_query_; }