Sets a transparent background for out-of-process subframes

by default.

This CL moves background color from WebView to WebFrameWidget,
which allows for setting the background color independently per
local root. WebViewImpl still implements background color for
the main frame, but it now goes through a WebViewFrameWidget
interface.

BUG=515625
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1565893004

Cr-Commit-Position: refs/heads/master@{#377937}

1 files changed, 4 insertions, 0 deletions

diff --git a/content/public/renderer/render_view.h b/content/public/renderer/render_view.h
index d02fa8f..f913f64 100644
--- a/content/public/renderer/render_view.h
+++ b/content/public/renderer/render_view.h
@@ -21,6 +21,7 @@
 namespace blink {
 class WebElement;
 class WebFrame;
+class WebFrameWidget;
 class WebLocalFrame;
 class WebNode;
 class WebString;
@@ -88,6 +89,9 @@ class CONTENT_EXPORT RenderView : public IPC::Sender {
   // Returns the associated WebView. May return NULL when the view is closing.
   virtual blink::WebView* GetWebView() = 0;
 
+  // Returns the associated WebFrameWidget.
+  virtual blink::WebFrameWidget* GetWebFrameWidget() = 0;
+
   // Returns true if we should display scrollbars for the given view size and
   // false if the scrollbars should be hidden.
   virtual bool ShouldDisplayScrollbars(int width, int height) const = 0;