Add CopyTexSubImage3D to GPU command buffer.

gpu/command_buffer/client/gles2_implementation_unittest_autogen.h

Index: gpu/command_buffer/client/gles2_implementation_unittest_autogen.h
diff --git a/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h b/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h
index 845ab06118275acdcfea9c6fd6fb0e755560dd0a..cc9c7957286b20f3198c96d5973277ec879f50e0 100644
--- a/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h
+++ b/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h
@@ -351,6 +351,17 @@ TEST_F(GLES2ImplementationTest, CopyTexSubImage2D) {
   EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
 }
 
+TEST_F(GLES2ImplementationTest, CopyTexSubImage3D) {
+  struct Cmds {
+    cmds::CopyTexSubImage3D cmd;
+  };
+  Cmds expected;
+  expected.cmd.Init(GL_TEXTURE_3D, 2, 3, 4, 5, 6, 7, 8, 9);
+
+  gl_->CopyTexSubImage3D(GL_TEXTURE_3D, 2, 3, 4, 5, 6, 7, 8, 9);
+  EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
+}
+
 TEST_F(GLES2ImplementationTest, CullFace) {
   struct Cmds {
     cmds::CullFace cmd;