Add "stylus-tools" Wayland protocol.

components/exo/surface.h

 // Copyright 2015 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_EXO_SURFACE_H_
 #define COMPONENTS_EXO_SURFACE_H_
 
 #include <list>
 #include <set>
 #include <utility>
@@ skipping 182 matching lines @@
   // Called when the begin frame source has changed.
   void SetBeginFrameSource(cc::BeginFrameSource* begin_frame_source);
 
   // Check whether this Surface and its children need to create new cc::Surface
   // IDs for their contents next time they get new buffer contents.
   void CheckIfSurfaceHierarchyNeedsCommitToNewSurfaces();
 
   // Returns the active contents size.
   gfx::Size content_size() const { return content_size_; }
 
+  // Returns true if this surface represents an annotation layer.
+  bool GetAnnotationLayer() const { return annotation_layer_; }

[reveman, 2017/05/23 16:41:06]

Can we add an ash window property for this instead of requiring browser code to
depend on exo?

[Vladislav Kaznacheev, 2017/05/23 23:48:56]

Done.

+
+  // Sets the "annotation layer" flag.
+  void SetAnnotationLayer(bool on) { annotation_layer_ = on; }

[reveman, 2017/05/23 16:41:06]

exo::Surface API should match the wayland interface as closely as possible to
avoid introducing unnecessary terms and concepts. ie. the name here should match
the request we add to the wayland interface for turning this on/off

[Vladislav Kaznacheev, 2017/05/23 23:48:55]

Done.

+
   // Overridden from ui::ContextFactoryObserver:
   void OnLostResources() override;
 
   // Overridden from aura::WindowObserver:
   void OnWindowAddedToRootWindow(aura::Window* window) override;
   void OnWindowRemovingFromRootWindow(aura::Window* window,
                                       aura::Window* new_root) override;
 
   // Overridden from ui::CompositorVSyncManager::Observer:
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
@@ skipping 167 matching lines @@
   SurfaceDelegate* delegate_ = nullptr;
 
   // Surface observer list. Surface does not own the observers.
   base::ObserverList<SurfaceObserver, true> observers_;
 
   // The begin frame source being observed.
   cc::BeginFrameSource* begin_frame_source_ = nullptr;
   bool needs_begin_frame_ = false;
   cc::BeginFrameAck current_begin_frame_ack_;
 
+  // Whether this surface represents an annotation layer.
+  bool annotation_layer_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SURFACE_H_