[Android] Always insert a TouchCancel if window or tab focus is lost

content/browser/android/content_view_core_impl.h

 // Copyright 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.
 
 #ifndef CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 
 #include <vector>
 
 #include "base/android/jni_android.h"
@@ skipping 327 matching lines @@
   void DeleteScaledSnapshotTexture();
 
   void SendGestureEvent(const blink::WebGestureEvent& event);
 
   // Update focus state of the RenderWidgetHostView.
   void SetFocusInternal(bool focused);
 
   // Send device_orientation_ to renderer.
   void SendOrientationChangeEventInternal();
 
+  // Utility method for synthesizing a touch cancel event and dispatching it
+  // through the touch pipeline.
+  void CancelActiveTouchSequenceIfNecessary();
+
   // A weak reference to the Java ContentViewCore object.
   JavaObjectWeakGlobalRef java_ref_;
 
   NotificationRegistrar notification_registrar_;
 
   // Reference to the current WebContents used to determine how and what to
   // display in the ContentViewCore.
   WebContentsImpl* web_contents_;
 
   // A compositor layer containing any layer that should be shown.
@@ skipping 24 matching lines @@
   bool geolocation_needs_pause_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentViewCoreImpl);
 };
 
 bool RegisterContentViewCore(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_