Moved GrGLFragmentProcessor definition to its own file

BUG=skia:

Review URL: https://codereview.chromium.org/1246193002
diff --git a/src/gpu/effects/GrConvexPolyEffect.cpp b/src/gpu/effects/GrConvexPolyEffect.cpp
index a3d032f..6ecba24 100644
--- a/src/gpu/effects/GrConvexPolyEffect.cpp
+++ b/src/gpu/effects/GrConvexPolyEffect.cpp
@@ -8,7 +8,7 @@
 #include "GrConvexPolyEffect.h"
 #include "GrInvariantOutput.h"
 #include "SkPathPriv.h"
-#include "gl/GrGLProcessor.h"
+#include "gl/GrGLFragmentProcessor.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 
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