Add ability to wire up sharelist in glcontext creation

include/gpu/gl/SkGLContext.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkGLContext_DEFINED
 #define SkGLContext_DEFINED
 
@@ skipping 100 matching lines @@
     SkAutoTUnref<const GrGLInterface> fGL;
 
     friend class GLFenceSync;  // For onPlatformGetProcAddress.
 };
 
 /** Creates platform-dependent GL context object
  * Returns a valid gl context object or NULL if such can not be created.
  * Note: If Skia embedder needs a custom GL context that sets up the GL
  * interface, this function should be implemented by the embedder.
  * Otherwise, the default implementation for the platform should be compiled in
  * the library.

[bsalomon, 2016/01/19 22:00:57]

Should comment on shareList. Also, name doesn't seem intuitive to me as it's not
a list.

Also, the param must be a context previously returned by
SkCreatePlatformGLContext. Otherwise it may be of the a unexpected subclass
(angle, osmesa, ...) .

[joshualitt, 2016/01/20 14:36:56]

Acknowledged.

  */
-SK_API SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI);
+SK_API SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI,
+                                              SkGLContext* shareList = nullptr);
 
 /**
  * Helper macros for using the GL context through the GrGLInterface. Example:
  * SK_GL(glCtx, GenTextures(1, &texID));
  */
 #define SK_GL(ctx, X) (ctx).gl()->fFunctions.f ## X;    \
                       SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
 #define SK_GL_RET(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X;    \
                   SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
 #define SK_GL_NOERRCHECK(ctx, X) (ctx).gl()->fFunctions.f ## X
 #define SK_GL_RET_NOERRCHECK(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X
 
 #endif