Don't submit empty frames in android webview

android_webview/browser/hardware_renderer.cc

 // Copyright 2014 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 "android_webview/browser/hardware_renderer.h"
 
 #include <utility>
 
 #include "android_webview/browser/aw_gl_surface.h"
 #include "android_webview/browser/aw_render_thread_context_provider.h"
@@ skipping 148 matching lines @@
 
 void HardwareRenderer::AllocateSurface() {
   DCHECK(!child_id_.is_valid());
   child_id_ = local_surface_id_allocator_->GenerateId();
   surfaces_->AddChildId(cc::SurfaceId(frame_sink_id_, child_id_));
 }
 
 void HardwareRenderer::DestroySurface() {
   DCHECK(child_id_.is_valid());
 
-  // Submit an empty frame to force any existing resources to be returned.
-  cc::CompositorFrame frame;
-  // We submit without a prior BeginFrame, so acknowledge a manual BeginFrame.
-  frame.metadata.begin_frame_ack =
-      cc::BeginFrameAck::CreateManualAckWithDamage();
-  support_->SubmitCompositorFrame(child_id_, std::move(frame));
   surfaces_->RemoveChildId(cc::SurfaceId(frame_sink_id_, child_id_));
   support_->EvictFrame();
   child_id_ = cc::LocalSurfaceId();
 }
 
 void HardwareRenderer::DidReceiveCompositorFrameAck(
     const cc::ReturnedResourceArray& resources) {
   ReturnResourcesToCompositor(resources, compositor_id_,
                               last_submitted_compositor_frame_sink_id_);
 }
@@ skipping 78 matching lines @@
   constexpr bool is_root = false;
   constexpr bool handles_frame_sink_id_invalidation = false;
   constexpr bool needs_sync_points = true;
   support_.reset();
   support_ = cc::CompositorFrameSinkSupport::Create(
       this, surfaces_->GetSurfaceManager(), frame_sink_id_, is_root,
       handles_frame_sink_id_invalidation, needs_sync_points);
 }
 
 }  // namespace android_webview