Hide location bar on Javascript-initiated scroll.

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index 2758407b2c2c1da090f874bbce94c15676063522..fd0d4ef8ce999c76f96b101ccd084af1bdef2f41 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -16,6 +16,7 @@
 #include "base/stringprintf.h"
 #include "base/values.h"
 #include "build/build_config.h"
+#include "cc/input/top_controls_state.h"
 #include "chrome/common/common_param_traits.h"
 #include "chrome/common/content_settings.h"
 #include "chrome/common/content_settings_pattern.h"
@@ -126,6 +127,7 @@ IPC_ENUM_TRAITS(ThemeBackgroundImageAlignment)
 IPC_ENUM_TRAITS(ThemeBackgroundImageTiling)
 IPC_ENUM_TRAITS(TranslateErrors::Type)
 IPC_ENUM_TRAITS(WebKit::WebConsoleMessage::Level)
+IPC_ENUM_TRAITS(cc::TopControlsState)
 
 IPC_STRUCT_TRAITS_BEGIN(ChromeViewHostMsg_GetPluginInfo_Status)
 IPC_STRUCT_TRAITS_MEMBER(value)
@@ -410,6 +412,14 @@ IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetClientSidePhishingDetection,
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_StartFrameSniffer,
                     string16 /* frame-name */)
 
+// Notifies the renderer whether hiding/showing the top controls is enabled,
+// what the current state should be, and whether or not to animate to the
+// proper state.
+IPC_MESSAGE_ROUTED3(ChromeViewMsg_UpdateTopControlsState,
+                    cc::TopControlsState /* constraints */,
+                    cc::TopControlsState /* current */,
+                    bool /* animate */)
+
 // JavaScript related messages -----------------------------------------------
 
 // Notify the JavaScript engine in the render to change its parameters