[Android WebView] Implement WebSettings.{get|set}LoadWithOverviewMode

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 39f1915d758672b82dce5bfb86cf2a76b14035ca..f3680e40e12b66c0dc240b804a7d8ba834f36089 100644
--- a/android_webview/common/render_view_messages.h
+++ b/android_webview/common/render_view_messages.h
@@ -64,6 +64,11 @@ IPC_SYNC_MESSAGE_ROUTED0_0(AwViewMsg_CapturePictureSync)
 IPC_MESSAGE_ROUTED1(AwViewMsg_SetTextZoomLevel,
                     double /* zoom_level */)
 
+// Resets WebKit WebView scrolling and scale state. We need to send this
+// message whenever we want to guarantee that page's scale will be
+// recalculated by WebKit.
+IPC_MESSAGE_ROUTED0(AwViewMsg_ResetScrollAndScaleState)
+
 //-----------------------------------------------------------------------------
 // RenderView messages
 // These are messages sent from the renderer to the browser process.