Fix grabbing capture when the mouse is pressed on Desktop Linux.

ui/events/devices/x11/device_data_manager_x11.h

 // 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.
 
 #ifndef UI_EVENTS_DEVICES_X11_DEVICE_DATA_MANAGER_X11_H_
 #define UI_EVENTS_DEVICES_X11_DEVICE_DATA_MANAGER_X11_H_
 
 // Generically-named #defines from Xlib is conflicting with symbols in GTest.
 // So many tests .cc file #undef Bool before including device_data_manager.h,
 // which makes Bool unrecognized in XInput2.h.
@@ skipping 221 matching lines @@
   void SetDisabledKeyboardAllowedKeys(
       scoped_ptr<std::set<KeyboardCode> > excepted_keys);
 
   // Disables and enables events from devices by device id.
   void DisableDevice(unsigned int deviceid);
   void EnableDevice(unsigned int deviceid);
 
   // Returns true if |native_event| should be blocked.
   bool IsEventBlocked(const base::NativeEvent& native_event);
 
+  const std::vector<int>& master_pointers() const {
+    return master_pointers_;
+  }
+
  protected:
   // DeviceHotplugEventObserver:
   void OnKeyboardDevicesUpdated(
       const std::vector<KeyboardDevice>& devices) override;
 
  private:
   DeviceDataManagerX11();
   ~DeviceDataManagerX11() override;
 
   // Initialize the XInput related system information.
@@ skipping 15 matching lines @@
   int xi_opcode_;
 
   // A quick lookup table for determining if the XI event is an XIDeviceEvent.
   std::bitset<kMaxXIEventType> xi_device_event_types_;
 
   // A quick lookup table for determining if events from the pointer device
   // should be processed.
   std::bitset<kMaxDeviceNum> cmt_devices_;
   std::bitset<kMaxDeviceNum> touchpads_;
 
+  // List of the master pointer devices.
+  std::vector<int> master_pointers_;
+
   // A quick lookup table for determining if events from the XI device
   // should be blocked.
   std::bitset<kMaxDeviceNum> blocked_devices_;
 
   // The set of keys allowed while the keyboard is blocked.
   scoped_ptr<std::set<KeyboardCode> > blocked_keyboard_allowed_keys_;
 
   // Number of valuators on the specific device.
   int valuator_count_[kMaxDeviceNum];
 
@@ skipping 28 matching lines @@
 
   unsigned char button_map_[256];
   int button_map_count_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceDataManagerX11);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_DEVICES_X11_DEVICE_DATA_MANAGER_X11_H_