fix warnings on Mac in src/gpu and include/gpu

Fix these class of warnings:
- unused functions
- unused locals
- sign mismatch
- missing function prototypes
- missing newline at end of file
- 64 to 32 bit truncation

The changes prefer to link in dead code in the debug build
with 'if (false)' than to comment it out, but trivial cases
are commented out or sometimes deleted if it appears to be
a copy/paste error.
Review URL: https://codereview.appspot.com/6296044

git-svn-id: http://skia.googlecode.com/svn/trunk@4180 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gpu/gl/GrGLStencilBuffer.h b/src/gpu/gl/GrGLStencilBuffer.h
index 87bdb4a819..7b3da4f34a 100644
--- a/src/gpu/gl/GrGLStencilBuffer.h
+++ b/src/gpu/gl/GrGLStencilBuffer.h
@@ -14,8 +14,8 @@
 
 class GrGLStencilBuffer : public GrStencilBuffer {
 public:
-    static const GrGLenum kUnknownInternalFormat = ~0;
-    static const GrGLuint kUnknownBitCount = ~0;
+    static const GrGLenum kUnknownInternalFormat = ~0U;
+    static const GrGLuint kUnknownBitCount = ~0U;
     struct Format {
         GrGLenum  fInternalFormat;
         GrGLuint  fStencilBits;