Store GLSL max samplers using uint32_t rather than uint8_t

src/gpu/glsl/GrGLSLCaps.h

Index: src/gpu/glsl/GrGLSLCaps.h
diff --git a/src/gpu/glsl/GrGLSLCaps.h b/src/gpu/glsl/GrGLSLCaps.h
index d18b71ae756ca214e247c1fb335dcf0050ef6e03..19a34620dc0f41c2a84e641f76f12d24b279a53f 100755
--- a/src/gpu/glsl/GrGLSLCaps.h
+++ b/src/gpu/glsl/GrGLSLCaps.h
@@ -214,10 +214,10 @@ private:
     const char* fFBFetchColorName;
     const char* fFBFetchExtensionString;
 
-    uint8_t fMaxVertexSamplers;
-    uint8_t fMaxGeometrySamplers;
-    uint8_t fMaxFragmentSamplers;
-    uint8_t fMaxCombinedSamplers;
+    uint32_t fMaxVertexSamplers;
+    uint32_t fMaxGeometrySamplers;
+    uint32_t fMaxFragmentSamplers;
+    uint32_t fMaxCombinedSamplers;
 
     AdvBlendEqInteraction fAdvBlendEqInteraction;