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

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index f94d49882278a31fa284d475f7bd9dfc664198be..5ad0c0978b4b2ed1fe353ec6f01af9611515c703 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -35,6 +35,7 @@
 #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 {
 
@@ -60,6 +61,12 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
 
   BrowserViewRenderer::CalculateTileMemoryPolicy();
 
+  // Android WebView apps can override WebView#computeScroll to achieve custom
+  // scroll/fling. As a result, the animations may not be ticked. This will
+  // confuse the tap suppression controller. So just disable it for WebView.
+  ui::GestureConfiguration::GetInstance()
+      ->set_fling_touchscreen_tap_suppression_enabled(false);
+
   base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
   cl->AppendSwitch(switches::kUseIpcCommandBuffer);
   cl->AppendSwitch(cc::switches::kEnableBeginFrameScheduling);