Fixed a few warnings

Removed a few warnings from the Skia code.
Review URL: https://codereview.chromium.org/12469003

git-svn-id: http://skia.googlecode.com/svn/trunk@7996 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index 4ae2c47..3f37297 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -423,7 +423,7 @@
      */
     class AutoColorRestore : public ::GrNoncopyable {
     public:
-        AutoColorRestore() : fDrawState(NULL) {}
+        AutoColorRestore() : fDrawState(NULL), fOldColor(0) {}
 
         AutoColorRestore(GrDrawState* drawState, GrColor color) {
             fDrawState = NULL;