gpu: Extend CopyTextureCHROMIUM with support for copying part of source texture.

gpu/blink/webgraphicscontext3d_impl.cc

Index: gpu/blink/webgraphicscontext3d_impl.cc
diff --git a/gpu/blink/webgraphicscontext3d_impl.cc b/gpu/blink/webgraphicscontext3d_impl.cc
index 61aac864195722a9a23131b5c47a2278578deb0a..f2e1434c32a2a6b8ac77ac17e9c5b9160485f15b 100644
--- a/gpu/blink/webgraphicscontext3d_impl.cc
+++ b/gpu/blink/webgraphicscontext3d_impl.cc
@@ -827,13 +827,17 @@ DELEGATE_TO_GL_5(copyTextureCHROMIUM,
                  WGC3Denum,
                  WGC3Denum);
 
-DELEGATE_TO_GL_5(copySubTextureCHROMIUM,
+DELEGATE_TO_GL_9(copySubTextureCHROMIUM,
                  CopySubTextureCHROMIUM,
                  WGC3Denum,
                  WebGLId,
                  WebGLId,
                  WGC3Dint,
-                 WGC3Dint);
+                 WGC3Dint,
+                 WGC3Dint,
+                 WGC3Dint,
+                 WGC3Dsizei,
+                 WGC3Dsizei);
 
 DELEGATE_TO_GL_3(bindUniformLocationCHROMIUM, BindUniformLocationCHROMIUM,
                  WebGLId, WGC3Dint, const WGC3Dchar*)