Enable a lot of extensions to increase fuzzer coverage

ui/gl/gl_stub_api.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 UI_GL_GL_STUB_API_H_
 #define UI_GL_GL_STUB_API_H_
 
+#include <string>
+
 #include "ui/gl/gl_export.h"
 #include "ui/gl/gl_stub_api_base.h"
 
 namespace gl {
 
 class GL_EXPORT GLStubApi: public GLStubApiBase {
  public:
+  GLStubApi();
+  ~GLStubApi() override;
+
+  void set_version(std::string version) { version_ = std::move(version); }
+
+  void set_extensions(std::string extensions) {
+    extensions_ = std::move(extensions);
+  }
+
   GLenum glCheckFramebufferStatusEXTFn(GLenum target) override;
   GLuint glCreateProgramFn(void) override;
   GLuint glCreateShaderFn(GLenum type) override;
   GLsync glFenceSyncFn(GLenum condition, GLbitfield flags) override;
   void glGenBuffersARBFn(GLsizei n, GLuint* buffers) override;
   void glGenerateMipmapEXTFn(GLenum target) override;
   void glGenFencesAPPLEFn(GLsizei n, GLuint* fences) override;
   void glGenFencesNVFn(GLsizei n, GLuint* fences) override;
   void glGenFramebuffersEXTFn(GLsizei n, GLuint* framebuffers) override;
   GLuint glGenPathsNVFn(GLsizei range) override;
@@ skipping 22 matching lines @@
   GLboolean glIsSyncFn(GLsync sync) override;
   GLboolean glIsTextureFn(GLuint texture) override;
   GLboolean glIsTransformFeedbackFn(GLuint id) override;
   GLboolean glIsVertexArrayOESFn(GLuint array) override;
   GLboolean glTestFenceAPPLEFn(GLuint fence) override;
   GLboolean glTestFenceNVFn(GLuint fence) override;
   GLboolean glUnmapBufferFn(GLenum target) override;
   GLenum glWaitSyncFn(GLsync sync,
                       GLbitfield flags,
                       GLuint64 timeout) override;
+
+ private:
+  std::string version_;
+  std::string extensions_;
+
+  DISALLOW_COPY_AND_ASSIGN(GLStubApi);
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_STUB_API_H_