Use ui::GestureConfiguration to disable tap suppression in Android WebView

android_webview/lib/main/aw_main_delegate.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 "android_webview/lib/main/aw_main_delegate.h"
 
 #include "android_webview/browser/aw_content_browser_client.h"
 #include "android_webview/browser/browser_view_renderer.h"
 #include "android_webview/browser/scoped_allow_wait_for_legacy_web_view_api.h"
 #include "android_webview/common/aw_switches.h"
@@ skipping 17 matching lines @@
 #include "components/external_video_surface/browser/android/external_video_surface_container_impl.h"
 #include "content/public/browser/android/browser_media_player_manager_register.h"
 #include "content/public/browser/browser_main_runner.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_descriptors.h"
 #include "content/public/common/content_switches.h"
 #include "gin/public/isolate_holder.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "media/base/media_switches.h"
+#include "ui/events/gesture_detection/gesture_configuration.h"
 
 namespace android_webview {
 
 namespace {
 
 // TODO(boliu): Remove this global Allow once the underlying issues are
 // resolved - http://crbug.com/240453. See AwMainDelegate::RunProcess below.
 base::LazyInstance<scoped_ptr<ScopedAllowWaitForLegacyWebViewApi> >
     g_allow_wait_in_ui_thread = LAZY_INSTANCE_INITIALIZER;
 
 }
 
 AwMainDelegate::AwMainDelegate() {
 }
 
 AwMainDelegate::~AwMainDelegate() {
 }
 
 bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   content::SetContentClient(&content_client_);
 
   content::RegisterMediaUrlInterceptor(new AwMediaUrlInterceptor());
 
   BrowserViewRenderer::CalculateTileMemoryPolicy();
 
+  ui::GestureConfiguration::GetInstance()
+      ->set_fling_touchscreen_tap_suppression_enabled(false);

[jdduke (slow), 2015/07/31 23:04:28]

This might be worth a comment, something about tap suppression interacting
poorly when the embedder prevents fling updates or something like that.

[hush (inactive), 2015/07/31 23:13:33]

Done.

+
   base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
   cl->AppendSwitch(switches::kUseIpcCommandBuffer);
   cl->AppendSwitch(cc::switches::kEnableBeginFrameScheduling);
 
   // WebView uses the Android system's scrollbars and overscroll glow.
   cl->AppendSwitch(switches::kDisableOverscrollEdgeEffect);
 
   // Pull-to-refresh should never be a default WebView action.
   cl->AppendSwitch(switches::kDisablePullToRefreshEffect);
 
@@ skipping 129 matching lines @@
 #if defined(VIDEO_HOLE)
 content::ExternalVideoSurfaceContainer*
 AwMainDelegate::CreateExternalVideoSurfaceContainer(
     content::WebContents* web_contents) {
   return external_video_surface::ExternalVideoSurfaceContainerImpl::Create(
       web_contents);
 }
 #endif
 
 }  // namespace android_webview