Don't send touchcancel on touch scroll start

chrome/browser/about_flags.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 "chrome/browser/about_flags.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 356 matching lines @@
 const Experiment::Choice kNotificationCenterTrayBehaviorChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
   { IDS_FLAGS_NOTIFICATION_TRAY_BEHAVIOR_NEVER,
     message_center::switches::kNotificationCenterTrayBehavior, "never" },
   { IDS_FLAGS_NOTIFICATION_TRAY_BEHAVIOR_ALWAYS,
     message_center::switches::kNotificationCenterTrayBehavior, "always" },
   { IDS_FLAGS_NOTIFICATION_TRAY_BEHAVIOR_UNREAD,
     message_center::switches::kNotificationCenterTrayBehavior, "unread" }
 };
 
+const Experiment::Choice kTouchScrollingModeChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_FLAGS_TOUCH_SCROLLING_MODE_TOUCHCANCEL,
+    switches::kTouchScrollingMode,
+    switches::kTouchScrollingModeTouchcancel },
+  { IDS_FLAGS_TOUCH_SCROLLING_MODE_ABSORB_TOUCHMOVE,
+    switches::kTouchScrollingMode,
+    switches::kTouchScrollingModeAbsorbTouchmove },
+  { IDS_FLAGS_TOUCH_SCROLLING_MODE_SYNC_TOUCHMOVE,
+    switches::kTouchScrollingMode,
+    switches::kTouchScrollingModeSyncTouchmove },
+};
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the experiment is the internal name. If you'd like to
 // gather statistics about the usage of your flag, you should append a marker
 // comment to the end of the feature name, like so:
 //   "my-special-feature",  // FLAGS:RECORD_UMA
 //
 // After doing that, run //tools/metrics/actions/extract_actions.py (see
 // instructions at the top of that file for details) to update the
 // chromeactions.txt file, which will enable UMA to record your feature flag.
@@ skipping 1488 matching lines @@
   },
 #if defined(ENABLE_APP_LIST)
   {
     "enable-experimental-app-list",
     IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_NAME,
     IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_DESCRIPTION,
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(app_list::switches::kEnableExperimentalAppList)
   },
 #endif
+  {
+    "touch-scrolling-mode",
+    IDS_FLAGS_TOUCH_SCROLLING_MODE_NAME,
+    IDS_FLAGS_TOUCH_SCROLLING_MODE_DESCRIPTION,
+    kOsWin | kOsLinux | kOsCrOS | kOsAndroid,
+    MULTI_VALUE_TYPE(kTouchScrollingModeChoices)
+  },
 };
 
 const Experiment* experiments = kExperiments;
 size_t num_experiments = arraysize(kExperiments);
 
 // Stores and encapsulates the little state that about:flags has.
 class FlagsState {
  public:
   FlagsState() : needs_restart_(false) {}
   void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
@@ skipping 499 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags