Only drag or maximize / restore when event has not yet been handled.

ash/wm/workspace/workspace_event_handler.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 "ash/wm/workspace/workspace_event_handler.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/touch/touch_uma.h"
 #include "ash/wm/coordinate_conversion.h"
@@ skipping 42 matching lines @@
 
 namespace internal {
 
 WorkspaceEventHandler::WorkspaceEventHandler() {
 }
 
 WorkspaceEventHandler::~WorkspaceEventHandler() {
 }
 
 void WorkspaceEventHandler::OnMouseEvent(ui::MouseEvent* event) {
+  if (event->handled())
+    return;
   aura::Window* target = static_cast<aura::Window*>(event->target());
   switch (event->type()) {
     case ui::ET_MOUSE_MOVED: {
       int component =
           target->delegate()->GetNonClientComponent(event->location());
       multi_window_resize_controller_.Show(target, component,
                                            event->location());
       break;
     }
     case ui::ET_MOUSE_ENTERED:
@@ skipping 15 matching lines @@
       multi_window_resize_controller_.Hide();
       HandleVerticalResizeDoubleClick(target_state, event);
       break;
     }
     default:
       break;
   }
 }
 
 void WorkspaceEventHandler::OnGestureEvent(ui::GestureEvent* event) {
+  if (event->handled())
+    return;
   aura::Window* target = static_cast<aura::Window*>(event->target());
   if (event->type() == ui::ET_GESTURE_TAP &&
       target->delegate()->GetNonClientComponent(event->location()) ==
       HTCAPTION) {
     if (event->details().tap_count() == 2) {
       ash::Shell::GetInstance()->metrics()->RecordUserMetricsAction(
           ash::UMA_TOGGLE_MAXIMIZE_CAPTION_GESTURE);
       // Note: TouchUMA::GESTURE_FRAMEVIEW_TAP is counted twice each time
       // TouchUMA::GESTURE_MAXIMIZE_DOUBLETAP is counted once.
       TouchUMA::GetInstance()->RecordGestureAction(
@@ skipping 56 matching lines @@
                                      work_area.width(),
                                      target->bounds().height()));
       }
       event->StopPropagation();
     }
   }
 }
 
 }  // namespace internal
 }  // namespace ash