Change Skia-related proto enums to uppercase

cc/proto/skxfermode.proto

Index: cc/proto/skxfermode.proto
diff --git a/cc/proto/skxfermode.proto b/cc/proto/skxfermode.proto
index b0b39630bebe78752da972d9b54e092dd4b0a11a..349aa8b9ef405f9f87f802a4f7101e63fea99ac3 100644
--- a/cc/proto/skxfermode.proto
+++ b/cc/proto/skxfermode.proto
@@ -10,37 +10,37 @@ package cc.proto;
 
 message SkXfermode {
   enum Mode {
-    Mode_Clear = 0;
-    Mode_Src = 1;
-    Mode_Dst = 2;
-    Mode_SrcOver = 3;
-    Mode_DstOver = 4;
-    Mode_SrcIn = 5;
-    Mode_DstIn = 6;
-    Mode_SrcOut = 7;
-    Mode_DstOut = 8;
-    Mode_SrcATop = 9;
-    Mode_DstATop = 10;
-    Mode_XOR = 11;
-    Mode_Plus = 12;
-    Mode_Modulate = 13;
+    CLEAR_ = 0;  // Clear() is a method for protos.
+    SRC = 1;
+    DST = 2;
+    SRC_OVER = 3;
+    DST_OVER = 4;
+    SRC_IN = 5;
+    DST_IN = 6;
+    SRC_OUT = 7;
+    DST_OUT = 8;
+    SRC_A_TOP = 9;
+    DST_A_TOP = 10;
+    XOR = 11;
+    PLUS = 12;
+    MODULATE = 13;
 
-    Mode_Screen = 14;
+    SCREEN = 14;
 
-    Mode_Overlay = 15;
-    Mode_Darken = 16;
-    Mode_Lighten = 17;
-    Mode_ColorDodge = 18;
-    Mode_ColorBurn = 19;
-    Mode_HardLight = 20;
-    Mode_SoftLight = 21;
-    Mode_Difference = 22;
-    Mode_Exclusion = 23;
-    Mode_Multiply = 24;
+    OVERLAY = 15;
+    DARKEN = 16;
+    LIGHTEN = 17;
+    COLOR_DODGE = 18;
+    COLOR_BURN = 19;
+    HARD_LIGHT = 20;
+    SOFT_LIGHT = 21;
+    DIFFERENCE_ = 22;
+    EXCLUSION = 23;
+    MULTIPLY = 24;
 
-    Mode_Hue = 25;
-    Mode_Saturation = 26;
-    Mode_Color = 27;
-    Mode_Luminosity = 28;
+    HUE = 25;
+    SATURATION = 26;
+    COLOR = 27;
+    LUMINOSITY = 28;
   }
-}
+}