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

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 5e0d3028d7f540e1da6f549a0eff20597d97d4df..ce9a5076731da26379ef2d317d9e148f6a0a7f5d 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1596,6 +1596,15 @@ void RenderWidgetHostViewAura::OnKeyEvent(ui::KeyEvent* 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);
 }