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
diff --git a/src/gpu/gl/GrGpuGL_program.cpp b/src/gpu/gl/GrGpuGL_program.cpp
index f383ffc..581a22a 100644
--- a/src/gpu/gl/GrGpuGL_program.cpp
+++ b/src/gpu/gl/GrGpuGL_program.cpp
@@ -249,7 +249,7 @@
 
 
 void GrGpuGL::flushColorMatrix() {
-    const ProgramDesc& desc = fCurrentProgram.getDesc();
+    // const ProgramDesc& desc = fCurrentProgram.getDesc();
     int matrixUni = fProgramData->fUniLocations.fColorMatrixUni;
     int vecUni = fProgramData->fUniLocations.fColorMatrixVecUni;
     if (GrGLProgram::kUnusedUniform != matrixUni
@@ -330,7 +330,7 @@
 
 void GrGpuGL::flushCoverage(GrColor coverage) {
     const ProgramDesc& desc = fCurrentProgram.getDesc();
-    const GrDrawState& drawState = this->getDrawState();
+    // const GrDrawState& drawState = this->getDrawState();
 
 
     if (this->getVertexLayout() & kCoverage_VertexLayoutBit) {