Added accurate TouchToMouseMode testing to SplitTap

ash/root_window_controller.h

Index: ash/root_window_controller.h
diff --git a/ash/root_window_controller.h b/ash/root_window_controller.h
index 5c91f5669671eb8db421af1d50c359bfeb83d275..94e13dc78a7e43ad9486a0802d53537db51e2adf 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -16,6 +16,7 @@
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/ui_base_types.h"
+#include "ui/chromeos/touch_exploration_controller.h"
 
 class SkBitmap;
 
@@ -114,6 +115,7 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   const aura::WindowTreeHost* GetHost() const;
   aura::Window* GetRootWindow();
   const aura::Window* GetRootWindow() const;
+  ui::TouchExplorationController* GetTouchExplorationController();

[mfomitchev, 2014/07/02 16:46:47]

Creating GetTouchExplorationController() in RWC just for the test seems bad.
Also, this would need to be surrounded by ifdef(OS_CHROMEOS). To make this a bit
cleaner, I'd suggest creating a test class wrapping RWC and putting the method
there. Take a look at WindowEventDispatcherTestApi and how it's used as an
example. You can then put the tests class into a chromeos-specific folder or add
"_chromeos" suffix to the filename to make sure it's not compiled on other oses.

Also a nit (not specific to this change): I think it would be good to get rid of
CallTapTimerNowForTesting() and instead inject base::MockTimer into
TouchExplorationCOntroller and then operate the MockTimer.

 
   RootWindowLayoutManager* root_window_layout() { return root_window_layout_; }