Sets a transparent background for out-of-process subframes.

android_webview/renderer/aw_render_frame_ext.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/common/aw_hit_test_data.h"
 #include "android_webview/common/render_view_messages.h"
 #include "android_webview/renderer/aw_render_frame_ext.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/renderer/android_content_detection_prefixes.h"
 #include "content/public/renderer/document_state.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
 #include "third_party/WebKit/public/platform/WebSecurityOrigin.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebElementCollection.h"
+#include "third_party/WebKit/public/web/WebFrameWidget.h"
 #include "third_party/WebKit/public/web/WebHitTestResult.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebMeaningfulLayout.h"
 #include "third_party/WebKit/public/web/WebNode.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "url/url_canon.h"
 #include "url/url_constants.h"
 #include "url/url_util.h"
 
 namespace android_webview {
@@ skipping 218 matching lines @@
 
 void AwRenderFrameExt::OnSetInitialPageScale(double page_scale_factor) {
   blink::WebView* webview = GetWebView();
   if (!webview)
     return;
 
   webview->setInitialPageScaleOverride(page_scale_factor);
 }
 
 void AwRenderFrameExt::OnSetBackgroundColor(SkColor c) {
-  blink::WebView* webview = GetWebView();
-  if (!webview)
+  blink::WebFrameWidget* web_frame_widget = GetWebFrameWidget();
+  if (!webframewidget)

[boliu, 2016/02/25 22:17:14]

this doesn't compile..

     return;
 
-  webview->setBaseBackgroundColor(c);
+  webframewidget->setBaseBackgroundColor(c);
 }
 
 void AwRenderFrameExt::OnSmoothScroll(int target_x,
                                       int target_y,
                                       int duration_ms) {
   blink::WebView* webview = GetWebView();
   if (!webview)
     return;
 
   webview->smoothScroll(target_x, target_y, static_cast<long>(duration_ms));
 }
 
 blink::WebView* AwRenderFrameExt::GetWebView() {
   if (!render_frame() || !render_frame()->GetRenderView() ||
       !render_frame()->GetRenderView()->GetWebView())
     return nullptr;
 
   return render_frame()->GetRenderView()->GetWebView();
 }
 
+blink::WebFrameWidget* AwRenderFrameExt::GetWebFrameWidget() {
+  if (!render_frame() || !render_frame()->GetRenderView())
+    return nullptr;
+
+  return render_frame()->GetRenderView()->GetWebFrameWidget();
+}
+
 }  // namespace android_webview