Hide location bar on WebKit programmatic scroll.

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 c87ff495a051340307cda2ef180a4421f39f2cc6..ae823047974cbfb31062461f2c4d67e58a0e7fd5 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -1356,6 +1356,9 @@ IPC_MESSAGE_ROUTED1(ViewMsg_ImeBatchStateChanged,
 IPC_MESSAGE_ROUTED1(ViewMsg_EnableHidingTopControls,
                     bool /* enable */)
 
+// Tells the renderer to show or hide the top controls.
+IPC_MESSAGE_ROUTED1(ViewMsg_ShowTopControls, bool /* show */)
+
 IPC_MESSAGE_ROUTED0(ViewMsg_ShowImeIfNeeded)
 
 #elif defined(OS_MACOSX)
@@ -1498,6 +1501,10 @@ IPC_MESSAGE_ROUTED0(ViewHostMsg_UpdateScreenRects_ACK)
 IPC_MESSAGE_ROUTED1(ViewHostMsg_RequestMove,
                     gfx::Rect /* position */)
 
+// Sent by the renderer process to notify the browser that the web page has
+// hidden the URL bar programmatically by means of a scroll.

[palmer, 2013/03/25 21:16:12]

"has hidden or shown"

NIT/ASTRONAUTISM: The name |RequestShowTopControls| isn't really distinct enough
from |ShowTopControls| above.  The names alone don't tell me that the two
messages differ in what direction the messages go, which seems important to me.
Consider giving these two types of IPC better names, if possible?

[aelias_OOO_until_Jul13, 2013/03/25 22:51:09]

How about renaming this to ViewHostMsg_DidProgrammaticallyScroll?  We could call
this "DidProgrammaticallyScroll" all the way from WebKit to the browser.

[John Knottenbelt, 2013/03/26 14:49:17]

Done.

+IPC_MESSAGE_ROUTED1(ViewHostMsg_RequestShowTopControls, bool /* show */);
+
 // Notifies the browser that a frame in the view has changed. This message
 // has a lot of parameters and is packed/unpacked by functions defined in
 // render_messages.h.