[Android] Support double-tap selection

content/browser/renderer_host/input/stylus_text_selector.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 "content/browser/renderer_host/input/stylus_text_selector.h"
 
 #include "ui/events/event_constants.h"
 #include "ui/events/gesture_detection/gesture_detector.h"
 #include "ui/events/gesture_detection/gesture_provider_config_helper.h"
 #include "ui/events/gesture_detection/motion_event.h"
@@ skipping 85 matching lines @@
   if (!gesture_detector_)
     gesture_detector_ = CreateGestureDetector(this);
 
   gesture_detector_->OnTouchEvent(event);
 
   // Always return true, even if |gesture_detector_| technically doesn't
   // consume the event. This prevents forwarding of a partial touch stream.
   return true;
 }
 
-bool StylusTextSelector::OnSingleTapUp(const MotionEvent& e) {
+bool StylusTextSelector::OnSingleTapUp(const MotionEvent& e, int tap_count) {
   DCHECK(text_selection_triggered_);
   DCHECK(!dragging_);
   client_->OnStylusSelectTap(e.GetEventTime(), e.GetX(), e.GetY());
   return true;
 }
 
 bool StylusTextSelector::OnScroll(const MotionEvent& e1,
                                   const MotionEvent& e2,
                                   float distance_x,
                                   float distance_y) {
@@ skipping 18 matching lines @@
 bool StylusTextSelector::ShouldStartTextSelection(const MotionEvent& event) {
   DCHECK_GT(event.GetPointerCount(), 0u);
   // Currently we are supporting stylus-only cases.
   const bool is_stylus = event.GetToolType(0) == MotionEvent::TOOL_TYPE_STYLUS;
   const bool is_only_secondary_button_pressed =
       event.GetButtonState() == MotionEvent::BUTTON_SECONDARY;
   return is_stylus && is_only_secondary_button_pressed;
 }
 
 }  // namespace content