Suppress ET_MOUSE_MOVE when the mouse hasn't moved on Windows.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 1578 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewAura, ui::EventHandler implementation:
 
 void RenderWidgetHostViewAura::OnKeyEvent(ui::KeyEvent* event) {
   event_handler_->OnKeyEvent(event);
 }
 
 void RenderWidgetHostViewAura::OnMouseEvent(ui::MouseEvent* event) {
+#if defined(OS_WIN)
+  if (event->type() == ui::ET_MOUSE_MOVED) {
+    if (event->location() == last_mouse_move_location_) {
+      event->SetHandled();
+      return;
+    }
+    last_mouse_move_location_ = event->location();
+  }
+#endif
   event_handler_->OnMouseEvent(event);
 }
 
 cc::FrameSinkId RenderWidgetHostViewAura::FrameSinkIdAtPoint(
     cc::SurfaceHittestDelegate* delegate,
     const gfx::Point& point,
     gfx::Point* transformed_point) {
   DCHECK(device_scale_factor_ != 0.0f);
 
   // The surface hittest happens in device pixels, so we need to convert the
@@ skipping 765 matching lines @@
 
 void RenderWidgetHostViewAura::SetPopupChild(
     RenderWidgetHostViewAura* popup_child_host_view) {
   popup_child_host_view_ = popup_child_host_view;
   event_handler_->SetPopupChild(
       popup_child_host_view,
       popup_child_host_view ? popup_child_host_view->event_handler() : nullptr);
 }
 
 }  // namespace content