Add support for new glShaderSource() signature from Khronos.  Disabled by default.

Review URL: https://codereview.appspot.com/6853068

git-svn-id: http://skia.googlecode.com/svn/trunk@6491 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp b/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp
index 4aff202..1af17b2 100644
--- a/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp
+++ b/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp
@@ -318,7 +318,11 @@
 
 GrGLvoid GR_GL_FUNCTION_TYPE debugGLShaderSource(GrGLuint shader,
                                                  GrGLsizei count,
+#if GR_USE_NEW_GL_SHADER_SOURCE_SIGNATURE
+                                                 const char* const * str,
+#else
                                                  const char** str,
+#endif
                                                  const GrGLint* length) {
 }