Enable RGBA_4444 in GpuRasterBufferProvider

cc/test/layer_tree_pixel_resource_test.cc

Index: cc/test/layer_tree_pixel_resource_test.cc
diff --git a/cc/test/layer_tree_pixel_resource_test.cc b/cc/test/layer_tree_pixel_resource_test.cc
index 05c4266d6757ac911ae9de3a4d7e4859712d6987..debefe1f76e4c09723e435a1957c3b77cba9dcb9 100644
--- a/cc/test/layer_tree_pixel_resource_test.cc
+++ b/cc/test/layer_tree_pixel_resource_test.cc
@@ -153,7 +153,8 @@ void LayerTreeHostPixelResourceTest::CreateResourceAndRasterBufferProvider(
 
       *raster_buffer_provider = base::MakeUnique<GpuRasterBufferProvider>(
           compositor_context_provider, worker_context_provider,
-          resource_provider, false, 0, false);
+          resource_provider, false, 0, PlatformColor::BestTextureFormat(),
+          false);
       break;
     case RASTER_BUFFER_PROVIDER_TYPE_ZERO_COPY:
       EXPECT_TRUE(compositor_context_provider);