Add command_buffer_gles2

gpu/gles2_conform_support/egl/egl.cc

 // Copyright (c) 2012 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.
 
 #include <EGL/egl.h>
 
 #include "base/command_line.h"
 #include "gpu/command_buffer/client/gles2_lib.h"
 #include "gpu/gles2_conform_support/egl/display.h"
 #include "ui/gl/gl_context.h"
@@ skipping 84 matching lines @@
 }
 
 EGLBoolean eglInitialize(EGLDisplay dpy, EGLint *major, EGLint *minor) {
   if (dpy == EGL_NO_DISPLAY)
     return EglError(EGL_BAD_DISPLAY, EGL_FALSE);
 
   egl::Display* display = static_cast<egl::Display*>(dpy);
   if (!display->Initialize())
     return EglError(EGL_NOT_INITIALIZED, EGL_FALSE);
 
-  int argc = 1;
-  const char* const argv[] = {
-    "dummy"
-  };
-  base::CommandLine::Init(argc, argv);
-  gfx::GLSurface::InitializeOneOff();
+  // eglInitialize can be called multiple times, prevent InitializeOneOff from
+  // being called multiple times.
+  if (gfx::GetGLImplementation() == gfx::kGLImplementationNone) {

[no sievers, 2015/08/28 18:39:33]

I think you can just run this code every time if you call gfx::ClearGLBindings()
form eglTerminate().

+    int argc = 1;
+    const char* const argv[] = {
+      "dummy"
+    };
+    base::CommandLine::Init(argc, argv);
+    gfx::GLSurface::InitializeOneOff();
+  }
 
   *major = 1;
   *minor = 4;
   return EglSuccess(EGL_TRUE);
 }
 
 EGLBoolean eglTerminate(EGLDisplay dpy) {
   EGLint error_code = ValidateDisplay(dpy);
   if (error_code != EGL_SUCCESS)
     return EglError(error_code, EGL_FALSE);
@@ skipping 300 matching lines @@
   return EGL_FALSE;
 }
 
 /* Now, define eglGetProcAddress using the generic function ptr. type */
 __eglMustCastToProperFunctionPointerType
 eglGetProcAddress(const char* procname) {
   return reinterpret_cast<__eglMustCastToProperFunctionPointerType>(
       gles2::GetGLFunctionPointer(procname));
 }
 }  // extern "C"