Avoid recreating hardware_renderer_ if a draw occurs during cleanup.

android_webview/browser/browser_view_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/browser_view_renderer.h"
 
 #include <utility>
 
 #include "android_webview/browser/browser_view_renderer_client.h"
 #include "android_webview/browser/child_frame.h"
@@ skipping 102 matching lines @@
   SetCompositorFrameConsumer(nullptr);
 }
 
 void BrowserViewRenderer::SetCompositorFrameConsumer(
     CompositorFrameConsumer* compositor_frame_consumer) {
   if (compositor_frame_consumer == compositor_frame_consumer_) {
     return;
   }
   if (compositor_frame_consumer_) {
     compositor_frame_consumer_->DeleteHardwareRendererOnUI();
+    ReturnUnusedResource(
+        compositor_frame_consumer_->PassUncommittedFrameOnUI());
     ReturnResourceFromParent(compositor_frame_consumer_);
     compositor_frame_consumer_->SetCompositorFrameProducer(nullptr);
   }
   compositor_frame_consumer_ = compositor_frame_consumer;
   if (compositor_frame_consumer_) {
     compositor_frame_consumer_->SetCompositorFrameProducer(this);
   }
 }
 
 void BrowserViewRenderer::RegisterWithWebContents(
@@ skipping 585 matching lines @@
   base::StringAppendF(&str,
                       "overscroll_rounding_error_: %s ",
                       overscroll_rounding_error_.ToString().c_str());
   base::StringAppendF(
       &str, "on_new_picture_enable: %d ", on_new_picture_enable_);
   base::StringAppendF(&str, "clear_view: %d ", clear_view_);
   return str;
 }
 
 }  // namespace android_webview