Use the NTP background color instead of white when there is no other info.

chrome/browser/ui/views/frame/contents_web_view.cc

Index: chrome/browser/ui/views/frame/contents_web_view.cc
diff --git a/chrome/browser/ui/views/frame/contents_web_view.cc b/chrome/browser/ui/views/frame/contents_web_view.cc
index f77f34515dd190739e49d64309bea88f202821c0..886f3058fe6e1203052601258227767235a03509 100644
--- a/chrome/browser/ui/views/frame/contents_web_view.cc
+++ b/chrome/browser/ui/views/frame/contents_web_view.cc
@@ -6,6 +6,7 @@
 
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/ui/views/status_bubble_views.h"
+#include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/base/theme_provider.h"
 #include "ui/compositor/layer_tree_owner.h"
@@ -64,6 +65,12 @@ void ContentsWebView::OnThemeChanged() {
       SkColorGetG(ntp_background) * kBackgroundBrightness / 0xFF,
       SkColorGetB(ntp_background) * kBackgroundBrightness / 0xFF,
       SkColorGetA(ntp_background)));
+
+  content::RenderWidgetHostView* rwhv = nullptr;
+  if (web_contents())
+    rwhv = web_contents()->GetRenderWidgetHostView();
+  if (rwhv)

[sky, 2016/05/02 20:04:33]

nit: move inside if block on 70 (or early return if web_contents() is null).

[chrishtr, 2016/05/02 20:24:02]

Done.

+    rwhv->SetBackgroundColor(ntp_background);
 }
 
 void ContentsWebView::OnLayerRecreated(ui::Layer* old_layer,
@@ -114,3 +121,9 @@ void ContentsWebView::DestroyClonedLayer() {
   SetPaintToLayer(false);
   set_layer_owner_delegate(nullptr);
 }
+
+void ContentsWebView::RenderViewReady() {
+  // Apply the theme color to be the default background on startup.
+  OnThemeChanged();
+  WebView::RenderViewReady();
+}