Force a commit when the webview's RenderFrameHost changes

Changing RFH can change the surface the WebContents draws into,
so we need to update the current draw quad being used. Since we
can't guarantee that we will get a timely wayland commit, force
one immediately

Bug: 143651420
Test: browsing webpages
Change-Id: I70ebe9b09551c0adbede1eebe245c899572a0984
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899751Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713195}

chromecast/browser/webview/web_content_controller.cc

@@ -394,6 +394,15 @@ void WebContentController::RenderFrameDeleted(
   current_render_frame_set_.erase(render_frame_host);
 }
 
+void WebContentController::RenderFrameHostChanged(
+    content::RenderFrameHost* old_host,
+    content::RenderFrameHost* new_host) {
+  // The surface ID may have changed, so trigger a new commit to re-issue the
+  // draw quad.
+  if (surface_)
+    surface_->Commit();
+}
+
 void WebContentController::OnJsClientInstanceRegistered(
     int process_id,
     int routing_id,

chromecast/browser/webview/web_content_controller.h

@@ -89,6 +89,8 @@ class WebContentController : public exo::SurfaceObserver,
   // content::WebContentsObserver
   void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
   void RenderFrameDeleted(content::RenderFrameHost* render_frame_host) override;
+  void RenderFrameHostChanged(content::RenderFrameHost* old_host,
+                              content::RenderFrameHost* new_host) override;
 
   // JsClientInstance::Observer
   void OnJsClientInstanceRegistered(int process_id,