Start making all .cpp files compile-able on all platforms.

src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp

Index: src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp
diff --git a/src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp b/src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp
index 39a6673b990af14e73d0b17e3da1330ce3e5e6ab..1df4a950c1126aa066bdc351326bbe47ea30e7e5 100644
--- a/src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp
+++ b/src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp
@@ -5,6 +5,9 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#include "SkTypes.h"
+#if defined(SK_BUILD_FOR_ANDROID)
+
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLAssembleInterface.h"
 #include "gl/GrGLUtil.h"
@@ -227,3 +230,5 @@ static GrGLFuncPtr android_get_gl_proc(void* ctx, const char name[]) {
 const GrGLInterface* GrGLCreateNativeInterface() {
     return GrGLAssembleInterface(nullptr, android_get_gl_proc);
 }
+
+#endif//defined(SK_BUILD_FOR_ANDROID)