Change mojo enums to be scoped enums in the generated C++ bindings.

components/mus/public/interfaces/input_event_constants.mojom

Index: components/mus/public/interfaces/input_event_constants.mojom
diff --git a/components/mus/public/interfaces/input_event_constants.mojom b/components/mus/public/interfaces/input_event_constants.mojom
index 900fc241d4beba91a5f95f6c88b99b63dabf47ea..1b4d18047871e74099c103990bd8c97b9b408ae0 100644
--- a/components/mus/public/interfaces/input_event_constants.mojom
+++ b/components/mus/public/interfaces/input_event_constants.mojom
@@ -17,33 +17,29 @@ enum EventType {
 
 // This mirrors ui::EventFlags
 // TODO(morrita): Use shift operator once it is available.
-enum EventFlags {
-  NONE                 =      0,
-  CAPS_LOCK_DOWN       =      1,
-  SHIFT_DOWN           =      2,
-  CONTROL_DOWN         =      4,
-  ALT_DOWN             =      8,
-  LEFT_MOUSE_BUTTON    =     16,
-  MIDDLE_MOUSE_BUTTON  =     32,
-  RIGHT_MOUSE_BUTTON   =     64,
-  COMMAND_DOWN         =    128,
-  EXTENDED             =    256,
-  IS_SYNTHESIZED       =    512,
-  ALTGR_DOWN           =   1024,
-  MOD3_DOWN            =   2048,
-  BACK_MOUSE_BUTTON    =   4096,
-  FORWARD_MOUSE_BUTTON =   8192,
-  NUM_LOCK_DOWN        =  16384,
-  SCROLL_LOCK_DOWN     =  32768,
-};
+const int32 kEventFlagNone               =      0;
+const int32 kEventFlagCapsLockDown       =      1;
+const int32 kEventFlagShiftDown          =      2;
+const int32 kEventFlagControlDown        =      4;
+const int32 kEventFlagAltDown            =      8;
+const int32 kEventFlagLeftMouseButton    =     16;

[yzshen1, 2016/01/07 19:24:52]

Ah, this is because we don't support shift operators...
Is it better to use hex numbers? 

[Sam McNally, 2016/01/08 05:12:51]

Done.

+const int32 kEventFlagMiddleMouseButton  =     32;
+const int32 kEventFlagRightMouseButton   =     64;
+const int32 kEventFlagCommandDown        =    128;
+const int32 kEventFlagExtended           =    256;
+const int32 kEventFlagIsSynthesized      =    512;
+const int32 kEventFlagAltgrDown          =   1024;
+const int32 kEventFlagMod3Down           =   2048;
+const int32 kEventFlagBackMouseButton    =   4096;
+const int32 kEventFlagForwardMouseButton =   8192;
+const int32 kEventFlagNumLockDown        =  16384;
+const int32 kEventFlagScrollLockDown     =  32768;
 
-enum MouseEventFlags {
-  IS_DOUBLE_CLICK     =  65536,
-  IS_TRIPLE_CLICK     = 131072,
-  IS_NON_CLIENT       = 262144,
+const int32 kMouseEventFlagIsDoubleClick =  65536;
+const int32 kMouseEventFlagIsTripleClick = 131072;
+const int32 kMouseEventFlagIsNonClient   = 262144;
 
-  // TODO(erg): Move accessibility flags and maybe synthetic touch events here.
-};
+// TODO(erg): Move accessibility flags and maybe synthetic touch events here.
 
 enum PointerKind {
   MOUSE,