Hooking up setBackgroundColor from AwContents to render process

android_webview/common/render_view_messages.h

Index: android_webview/common/render_view_messages.h
diff --git a/android_webview/common/render_view_messages.h b/android_webview/common/render_view_messages.h
index 68ce3bc2524b1110dcac2743934f46e1eb029ad6..69f826c95757d064664d65d9d850520ca646ea3b 100644
--- a/android_webview/common/render_view_messages.h
+++ b/android_webview/common/render_view_messages.h
@@ -8,6 +8,7 @@
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
+#include "third_party/skia/include/core/SkColor.h"
 
 // Singly-included section for enums and custom IPC traits.
 #ifndef ANDROID_WEBVIEW_COMMON_RENDER_VIEW_MESSAGES_H_
@@ -66,6 +67,10 @@ IPC_MESSAGE_ROUTED0(AwViewMsg_ResetScrollAndScaleState)
 IPC_MESSAGE_ROUTED1(AwViewMsg_SetInitialPageScale,
                     double /* page_scale_factor */)
 
+// Sets the base background color for this view.
+IPC_MESSAGE_ROUTED1(AwViewMsg_SetBackgroundColor,
+                    SkColor);
+
 //-----------------------------------------------------------------------------
 // RenderView messages
 // These are messages sent from the renderer to the browser process.