Passthrough Cmd decoder: Handle TEXTURE_RECTANGLE

This is needed to make the passthrough command decoder able to be used
on Mac as IOSurfaces will be bound to rectangle textures.

BUG=757974

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Id02f2ba6171841a1daebb5f987354f227b4c2f6a
Reviewed-on: https://chromium-review.googlesource.com/714117
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508145}

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc

@@ -678,6 +678,9 @@ bool GLES2DecoderPassthroughImpl::Initialize(
       feature_info_->feature_flags().nv_egl_stream_consumer_external) {
     bound_textures_[GL_TEXTURE_EXTERNAL_OES].resize(num_texture_units);
   }
+  if (feature_info_->feature_flags().arb_texture_rectangle) {
+    bound_textures_[GL_TEXTURE_RECTANGLE_ARB].resize(num_texture_units);
+  }
 
   // Initialize the tracked buffer bindings
   bound_buffers_[GL_ARRAY_BUFFER] = 0;