Update CHROMIUM_copy_texture entry points to the ES3 versions.

BUG=angleproject:1932

Change-Id: Ia45f8522320af1d747fbfb57468e8b881b033543
Reviewed-on: https://chromium-review.googlesource.com/459101
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/renderer/TextureImpl.cpp b/src/libANGLE/renderer/TextureImpl.cpp
index c5e68cf..47a7390 100644
--- a/src/libANGLE/renderer/TextureImpl.cpp
+++ b/src/libANGLE/renderer/TextureImpl.cpp
@@ -20,8 +20,11 @@
 }
 
 gl::Error TextureImpl::copyTexture(ContextImpl *contextImpl,
+                                   GLenum target,
+                                   size_t level,
                                    GLenum internalFormat,
                                    GLenum type,
+                                   size_t sourceLevel,
                                    bool unpackFlipY,
                                    bool unpackPremultiplyAlpha,
                                    bool unpackUnmultiplyAlpha,
@@ -32,7 +35,10 @@
 }
 
 gl::Error TextureImpl::copySubTexture(ContextImpl *contextImpl,
+                                      GLenum target,
+                                      size_t level,
                                       const gl::Offset &destOffset,
+                                      size_t sourceLevel,
                                       const gl::Rectangle &sourceArea,
                                       bool unpackFlipY,
                                       bool unpackPremultiplyAlpha,