Include SkTypes before using ifdefs.

Fixes Android framework build.

When building for the Android framework, we depend on SkUserConfig.h
to define things like SK_SUPPORT_GPU. So we cannot have the first
include inside a guard requring SK_SUPPORT_GPU to be defined. Include
SkTypes first, which will pull in SkUserConfig, define the flag, and
allow us to include GrContextFactory.h.

R=reed@google.com, djsollen@google.com

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/394533003

tests/ImageNewShaderTest.cpp

@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 
+#include "SkTypes.h"
 #if SK_SUPPORT_GPU
 #include "GrContextFactory.h"
 #endif