Dump property values for the touch log source

ui/ozone/public/input_controller.h

Index: ui/ozone/public/input_controller.h
diff --git a/ui/ozone/public/input_controller.h b/ui/ozone/public/input_controller.h
index 4cb04fd95cc3d47deefc8a2a637b6199f5b6e95e..0a1d3b8e57eb97b05f4596083245a70d6a075cc9 100644
--- a/ui/ozone/public/input_controller.h
+++ b/ui/ozone/public/input_controller.h
@@ -6,6 +6,7 @@
 #define UI_OZONE_PUBLIC_INPUT_CONTROLLER_H_
 
 #include <set>
+#include <string>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ -55,6 +56,9 @@ class OZONE_EXPORT InputController {
   virtual void SetMouseSensitivity(int value) = 0;
   virtual void SetPrimaryButtonRight(bool right) = 0;
 
+  // Touch log collection.
+  virtual std::string GetGestureDeviceStatus() = 0;

[spang, 2015/01/23 18:39:43]

This needs to be asynchronous because we are moving gestures to a different
thread to avoid cursor jank. I do not want to land new code that requires
synchronous access to gestures.
 
Also, please don't say "gestures" in the name. Functions in this interface
should have generic names.

So something like:

typedef base::Callback<void(scoped_ptr<std::string>)>
    GetTouchpadDebugLogsReply;
void GetTouchpadDebugLogs(const GetTouchpadDebugLogsReply& reply);

How big can the log get? If it is very large, it might be necessary to stream
the data instead of passing it in one big string.

+
   // Temporarily enable/disable Tap-to-click. Used to enhance the user
   // experience in some use cases (e.g., typing, watching video).
   virtual void SetTapToClickPaused(bool state) = 0;