scheduler: Add main thread gesture as a detected use case

components/scheduler/renderer/renderer_scheduler_impl.h

 // Copyright 2014 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 COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 #define COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
@@ skipping 344 matching lines @@
     ~AnyThread();
 
     base::TimeTicks last_idle_period_end_time;
     base::TimeTicks rails_loading_priority_deadline;
     base::TimeTicks fling_compositor_escalation_deadline;
     UserModel user_model;
     bool awaiting_touch_start_response;
     bool in_idle_period;
     bool begin_main_frame_on_critical_path;
     bool last_gesture_was_compositor_driven;
+    bool default_gesture_prevented;
     bool have_seen_touchstart;
   };
 
   struct CompositorThreadOnly {
     CompositorThreadOnly();
     ~CompositorThreadOnly();
 
     blink::WebInputEvent::Type last_input_type;
     std::unique_ptr<base::ThreadChecker> compositor_thread_checker;
 
@@ skipping 40 matching lines @@
 
   PollableThreadSafeFlag policy_may_need_update_;
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererSchedulerImpl);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_