Move definitions of GrGL basic types (e.g. GrGLenum) to their own header.

include/gpu/gl/GrGLTypes.h

Index: include/gpu/gl/GrGLTypes.h
diff --git a/include/gpu/gl/GrGLTypes.h b/include/gpu/gl/GrGLTypes.h
new file mode 100644
index 0000000000000000000000000000000000000000..e2eadb393dee5b1e94ca71ce40c5c623c96496ba
--- /dev/null
+++ b/include/gpu/gl/GrGLTypes.h
@@ -0,0 +1,61 @@
+
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrGLTypes_DEFINED
+#define GrGLTypes_DEFINED
+
+#include "GrGLConfig.h"
+
+/**
+ * Classifies GL contexts by which standard they implement (currently as OpenGL vs. OpenGL ES).
+ */
+enum GrGLStandard {
+    kNone_GrGLStandard,
+    kGL_GrGLStandard,
+    kGLES_GrGLStandard,
+};
+static const int kGrGLStandardCnt = 3;
+
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Declares typedefs for all the GL functions used in GrGLInterface
+ */
+
+typedef unsigned int GrGLenum;
+typedef unsigned char GrGLboolean;
+typedef unsigned int GrGLbitfield;
+typedef signed char GrGLbyte;
+typedef char GrGLchar;
+typedef short GrGLshort;
+typedef int GrGLint;
+typedef int GrGLsizei;
+typedef int64_t GrGLint64;
+typedef unsigned char GrGLubyte;
+typedef unsigned short GrGLushort;
+typedef unsigned int GrGLuint;
+typedef uint64_t GrGLuint64;
+typedef float GrGLfloat;
+typedef float GrGLclampf;
+typedef double GrGLdouble;
+typedef double GrGLclampd;
+typedef void GrGLvoid;
+#ifndef SK_IGNORE_64BIT_OPENGL_CHANGES
+#ifdef _WIN64
+typedef signed long long int GrGLintptr;
+typedef signed long long int GrGLsizeiptr;
+#else
+typedef signed long int GrGLintptr;
+typedef signed long int GrGLsizeiptr;
+#endif
+#else
+typedef signed long int GrGLintptr;
+typedef signed long int GrGLsizeiptr;
+#endif
+
+#endif