Adding drawable to CRD andorid and iOS gl rendering pipeline.

remoting/client/display/sys_opengl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_CLIENT_DISPLAY_SYS_OPENGL_H_
 #define REMOTING_CLIENT_DISPLAY_SYS_OPENGL_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_IOS)
 #include <OpenGLES/ES3/gl.h>
 #elif defined(OS_LINUX)
 #define GL_GLEXT_PROTOTYPES
 #include <GL/gl.h>
 #include <GL/glext.h>
 #elif defined(OS_MACOSX)
 #define GL_GLEXT_PROTOTYPES
 #include <OpenGL/gl.h>
 #include <OpenGL/glext.h>
+#elif defined(OS_ANDROID)
+#include <EGL/egl.h>

[Yuwei, 2017/01/09 22:41:54]

Why is EGL included here? I think it's only used the EglThreadContext... Also
OpenGL and EGL are different components.

[nicholss, 2017/01/09 22:51:12]

I am trying to make the android side compile. GLES3/gl3.h is not being found for
android. I am not sure how it worked before... Any ideas?

I might have fixed it in the build file with:

```
libs = [
      "OpenSLES",
      "EGL",
    ]
```

But need to revert this change.

[Yuwei, 2017/01/09 23:06:37]

Yeah but why EGL/egl.h...
I felt like it's related to moving sys_opengl.h into this directory but this
doesn't explain why your previous CL compiles...

Maybe you can try adding this to display/BUILD.gn:

if (OS_ANDROID) {
  libs = ["GLESv2"]
}

This dependency wasn't specified but the compiler still somehow worked...

 #else
 #include <GLES3/gl3.h>
 #endif  // defined(OS_IOS)
 
 #endif  // REMOTING_CLIENT_DISPLAY_SYS_OPENGL_H_