Enable RGBA_4444 in GpuRasterBufferProvider

cc/raster/gpu_raster_buffer_provider.h

Index: cc/raster/gpu_raster_buffer_provider.h
diff --git a/cc/raster/gpu_raster_buffer_provider.h b/cc/raster/gpu_raster_buffer_provider.h
index 195eef840333449b75270f5077bd2aa2e57f636f..248a72f9960ef1841bfd72ef1de7792f6b36765a 100644
--- a/cc/raster/gpu_raster_buffer_provider.h
+++ b/cc/raster/gpu_raster_buffer_provider.h
@@ -22,6 +22,7 @@ class CC_EXPORT GpuRasterBufferProvider : public RasterBufferProvider {
                           ResourceProvider* resource_provider,
                           bool use_distance_field_text,
                           int gpu_rasterization_msaa_sample_count,
+                          ResourceFormat preferred_tile_format,
                           bool async_worker_context_enabled);
   ~GpuRasterBufferProvider() override;
 
@@ -91,6 +92,7 @@ class CC_EXPORT GpuRasterBufferProvider : public RasterBufferProvider {
   ResourceProvider* const resource_provider_;
   const bool use_distance_field_text_;
   const int msaa_sample_count_;
+  const ResourceFormat preferred_tile_format_;
   const bool async_worker_context_enabled_;
 
   std::set<RasterBufferImpl*> pending_raster_buffers_;