Add a --use-angle flag for selecting the ANGLE renderer.

ui/gl/gl_surface_egl.h

 // 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.
 
 #ifndef UI_GL_GL_SURFACE_EGL_H_
 #define UI_GL_GL_SURFACE_EGL_H_
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include <string>
 
+#include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/vsync_provider.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_surface.h"
 
 namespace gfx {
 
 // Get default EGL display for GLSurfaceEGL (differs by platform).
 EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay();
 
+enum DisplayType {
+  DEFAULT,
+  SWIFT_SHADER,
+  ANGLE_WARP,
+  ANGLE_D3D9,
+  ANGLE_D3D11,
+  ANGLE_OPENGL,
+  ANGLE_OPENGLES,
+};
+
+GL_EXPORT void GetEGLInitDisplays(bool supports_angle_d3d,
+                                  bool supports_angle_opengl,
+                                  const base::CommandLine* command_line,
+                                  std::vector<DisplayType>* init_displays);
+
 // Interface for EGL surface.
 class GL_EXPORT GLSurfaceEGL : public GLSurface {
  public:
   GLSurfaceEGL();
 
   // Implement GLSurface.
   void DestroyAndTerminateDisplay() override;
   EGLDisplay GetDisplay() override;
 
   static bool InitializeOneOff();
@@ skipping 117 matching lines @@
   ~SurfacelessEGL() override;
 
  private:
   gfx::Size size_;
   DISALLOW_COPY_AND_ASSIGN(SurfacelessEGL);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_EGL_H_