Revert 198519 "Notify all visible renderers when the visibility ..."

> Notify all visible renderers when the visibility of the mouse cursor changes
> 
> Blink side patch:
> https://codereview.chromium.org/14047016/
> 
> The ultimate goal of both patches is to disallow new hover
> effects from being invoked in web contents when the mouse
> cursor is not visible to the user (i.e., while touch
> scrolling). The job of this patch is to communicate the
> cursor visibility state to all visible renderers using
> the new IPC InputMsg_CursorVisibilityChange whenever the
> visibility state changes.
> 
> Added the new observer type CursorClientObserver.
> Subscribers (instances of RenderWidgetHostViewAura) are
> notified whenever the cursor visibility changes, at which
> point the IPC is sent to the renderer.
> 
> I have also removed the code in ash_native_cursor_manager.cc
> that sets the mouse cursor location to the bogus value
> of (-10000,-10000) when mouse events are disabled; afaik
> this was originally added as a way to prevent unwanted
> hover effects in web contents but it does not work in all
> cases and causes other problems (see crbug.com/174358).
> 
> BUG=153784,174358
> R=jamesr@chromium.org, kenrb@chromium.org, oshima@chromium.org, sky@chromium.org
> 
> Review URL: https://codereview.chromium.org/14047015

TBR=tdanderson@google.com

Review URL: https://codereview.chromium.org/14975004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198526 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 0 deletions

diff --git a/ash/wm/ash_native_cursor_manager.cc b/ash/wm/ash_native_cursor_manager.cc
index dd72af1..be9c6b7 100644
--- a/ash/wm/ash_native_cursor_manager.cc
+++ b/ash/wm/ash_native_cursor_manager.cc
@@ -13,6 +13,10 @@
 
 namespace  {
 
+// The coordinate of the cursor used when the mouse events are disabled.
+const int kDisabledCursorLocationX = -10000;
+const int kDisabledCursorLocationY = -10000;
+
 void SetCursorOnAllRootWindows(gfx::NativeCursor cursor) {
   ash::Shell::RootWindowList root_windows =
       ash::Shell::GetInstance()->GetAllRootWindows();
@@ -95,6 +99,8 @@ void AshNativeCursorManager::SetMouseEventsEnabled(
         disabled_cursor_location_);
   } else {
     disabled_cursor_location_ = aura::Env::GetInstance()->last_mouse_location();
+    aura::Env::GetInstance()->set_last_mouse_location(
+        gfx::Point(kDisabledCursorLocationX, kDisabledCursorLocationY));
   }
 
   SetVisibility(delegate->GetCurrentVisibility(), delegate);