Enable touch-initiated drag-drop work on Windows

content/browser/renderer_host/render_widget_host_view_win.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_win.h"
 
 #include <dwmapi.h>
 #include <InputScope.h>
 
 #include <algorithm>
@@ skipping 394 matching lines @@
       can_compose_inline_(true),
       is_fullscreen_(false),
       ignore_mouse_movement_(true),
       composition_range_(ui::Range::InvalidRange()),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           touch_state_(new WebTouchState(this))),
       pointer_down_context_(false),
       last_touch_location_(-1, -1),
       touch_events_enabled_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(
-          gesture_recognizer_(ui::GestureRecognizer::Create(this))) {
+          gesture_recognizer_(ui::GestureRecognizer::Create(this))),
+      has_valid_long_press_gesture_(false) {
   render_widget_host_->SetView(this);
   registrar_.Add(this,
                  NOTIFICATION_RENDERER_PROCESS_TERMINATED,
                  NotificationService::AllBrowserContextsAndSources());
 }
 
 RenderWidgetHostViewWin::~RenderWidgetHostViewWin() {
   UnlockMouse();
   ResetTooltip();
 }
@@ skipping 1307 matching lines @@
       handled = FALSE;
       return 0;
   }
 }
 
 LRESULT RenderWidgetHostViewWin::OnMouseEvent(UINT message, WPARAM wparam,
                                               LPARAM lparam, BOOL& handled) {
   TRACE_EVENT0("browser", "RenderWidgetHostViewWin::OnMouseEvent");
   handled = TRUE;
 
+  // Set the long press gesture is invalid once mouse up event is received.
+  // On Windows, a mouse up event gets triggerred once a touch point is
+  // removed from screen.
+  if (message == WM_LBUTTONUP || message == WM_RBUTTONUP)
+    has_valid_long_press_gesture_ = false;
+
   if (message == WM_MOUSELEAVE)
     ignore_mouse_movement_ = true;
 
   if (mouse_locked_) {
     HandleLockedMouseEvent(message, wparam, lparam);
     MoveCursorToCenterIfNecessary();
     return 0;
   }
 
   if (::IsWindow(tooltip_hwnd_)) {
@@ skipping 1057 matching lines @@
   }
 
   WebKit::WebGestureEvent web_gesture = CreateWebGestureEvent(m_hWnd, *gesture);
   if (web_gesture.type == WebKit::WebGestureEvent::Undefined)
     return false;
   if (web_gesture.type == WebKit::WebGestureEvent::GestureTapDown) {
     render_widget_host_->ForwardGestureEvent(
         CreateFlingCancelEvent(gesture->time_stamp().InSecondsF()));
   }
   render_widget_host_->ForwardGestureEvent(web_gesture);
+
+  if (web_gesture.type == WebKit::WebGestureEvent::GestureLongPress)
+    has_valid_long_press_gesture_ = true;
+
   return true;
 }
 
 void RenderWidgetHostViewWin::ForwardMouseEventToRenderer(UINT message,
                                                           WPARAM wparam,
                                                           LPARAM lparam) {
   TRACE_EVENT0("browser",
                "RenderWidgetHostViewWin::ForwardMouseEventToRenderer");
   if (!render_widget_host_) {
     TRACE_EVENT0("browser", "EarlyOut_NoRWH");
@@ skipping 303 matching lines @@
   return new RenderWidgetHostViewWin(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(
       WebKit::WebScreenInfo* results) {
   GetScreenInfoForWindow(results, 0);
 }
 
 }  // namespace content