[Ozone] Proper cursor support for multi-monitor configurations

ui/ozone/platform/dri/dri_surface_factory.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/dri/dri_surface_factory.h"
 
 #include <drm.h>
 #include <errno.h>
 #include <xf86drm.h>
 
@@ skipping 297 matching lines @@
       controllers_.erase(it);
       return;
     }
   }
 }
 
 bool DriSurfaceFactory::DisableHardwareDisplayController(uint32_t crtc) {
   return drm_->DisableCrtc(crtc);
 }
 
+gfx::Size DriSurfaceFactory::GetWidgetSize(gfx::AcceleratedWidget w) {
+  if (IsWidgetValid(w)) {
+    HardwareDisplayController* controller = GetControllerForWidget(w);
+    return gfx::Size(controller->get_mode().hdisplay,
+                     controller->get_mode().vdisplay);
+  }
+
+  return gfx::Size(0, 0);
+}
+
 void DriSurfaceFactory::SetHardwareCursor(gfx::AcceleratedWidget window,
                                           const SkBitmap& image,
                                           const gfx::Point& location) {
   cursor_bitmap_ = image;
   cursor_location_ = location;
 
   if (state_ != INITIALIZED)
     return;
 
   ResetCursor(window);
@@ skipping 89 matching lines @@
 
 HardwareDisplayController* DriSurfaceFactory::GetControllerForWidget(
     gfx::AcceleratedWidget w) {
   HardwareDisplayControllerMap::iterator it = controllers_.find(w);
   CHECK(it != controllers_.end());
 
   return it->second;
 }
 
 }  // namespace ui