Set an initial background for RenderFrameHosts during commit.

content/browser/frame_host/render_frame_host_manager_unittest.cc

Index: content/browser/frame_host/render_frame_host_manager_unittest.cc
diff --git a/content/browser/frame_host/render_frame_host_manager_unittest.cc b/content/browser/frame_host/render_frame_host_manager_unittest.cc
index fd4f31722ea02abaa22cb7b663d1d9a24e7e4061..6f330425e8931e9763b56d660d11dca95ec1eaf5 100644
--- a/content/browser/frame_host/render_frame_host_manager_unittest.cc
+++ b/content/browser/frame_host/render_frame_host_manager_unittest.cc
@@ -934,6 +934,8 @@ TEST_F(RenderFrameHostManagerTest, Navigate) {
   EXPECT_FALSE(host->GetSiteInstance()->HasSite());
   host->GetSiteInstance()->SetSite(kUrl1);
 
+  manager->GetRenderWidgetHostView()->SetBackgroundColor(SK_ColorRED);
+
   // 2) Navigate to next site. -------------------------
   const GURL kUrl2("http://www.google.com/foo");
   NavigationEntryImpl entry2(
@@ -953,6 +955,9 @@ TEST_F(RenderFrameHostManagerTest, Navigate) {
   ASSERT_TRUE(host);
   EXPECT_TRUE(host->GetSiteInstance()->HasSite());
 
+  EXPECT_EQ(SK_ColorRED,
+            manager->GetRenderWidgetHostView()->background_color());
+
   // 3) Cross-site navigate to next site. --------------
   const GURL kUrl3("http://webkit.org/");
   NavigationEntryImpl entry3(
@@ -978,6 +983,9 @@ TEST_F(RenderFrameHostManagerTest, Navigate) {
 
   // We should observe RVH changed event.
   EXPECT_TRUE(change_observer.DidHostChange());
+
+  EXPECT_EQ(SK_ColorRED,
+            manager->GetRenderWidgetHostView()->background_color());
 }
 
 // Tests WebUI creation.