GPU process clients can perform a "shallow" finish.

gpu/command_buffer/client/gles2_interface_stub_autogen.h

Index: gpu/command_buffer/client/gles2_interface_stub_autogen.h
===================================================================
--- gpu/command_buffer/client/gles2_interface_stub_autogen.h	(revision 207109)
+++ gpu/command_buffer/client/gles2_interface_stub_autogen.h	(working copy)
@@ -77,7 +77,6 @@
 virtual void EnableVertexAttribArray(GLuint index) OVERRIDE;
 virtual void Finish() OVERRIDE;
 virtual void Flush() OVERRIDE;
-virtual void ShallowFlushCHROMIUM() OVERRIDE;
 virtual void FramebufferRenderbuffer(
     GLenum target, GLenum attachment, GLenum renderbuffertarget,
     GLuint renderbuffer) OVERRIDE;
@@ -165,6 +164,8 @@
 virtual void ShaderSource(
     GLuint shader, GLsizei count, const GLchar* const* str,
     const GLint* length) OVERRIDE;
+virtual void ShallowFinishCHROMIUM() OVERRIDE;
+virtual void ShallowFlushCHROMIUM() OVERRIDE;
 virtual void StencilFunc(GLenum func, GLint ref, GLuint mask) OVERRIDE;
 virtual void StencilFuncSeparate(
     GLenum face, GLenum func, GLint ref, GLuint mask) OVERRIDE;