[WIP] Add Chromium-side support for the Screen Orientation API

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 20bec60476a247f0039a3a9d0ecf80ad1a20fa91..b50672ad8009daeafd40397944ec3896c6c1d728 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -2144,6 +2144,15 @@ IPC_MESSAGE_ROUTED0(ViewHostMsg_HideValidationMessage)
 IPC_MESSAGE_ROUTED1(ViewHostMsg_MoveValidationMessage,
                     gfx::Rect /* anchor rectangle in root view coordinate */)
 
+// Sent by the renderer to the browser to request locking orientations by given
+// orientations map.
+IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_LockScreenOrientation,
+                            unsigned char /* orientations bit map */,
+                            bool /* lock operation result */)
+
+// Sent by the renderer to the browser to release orientation lock.
+IPC_MESSAGE_CONTROL0(ViewHostMsg_UnlockScreenOrientation)
+
 #if defined(OS_ANDROID)
 // Response to ViewMsg_FindMatchRects.
 //