Add gl tests to make sure when a buffer is unmapped, all access path generates an INVALID_OPERATION.

gpu/command_buffer/service/program_manager.cc

Index: gpu/command_buffer/service/program_manager.cc
diff --git a/gpu/command_buffer/service/program_manager.cc b/gpu/command_buffer/service/program_manager.cc
index 754d5b0630b16d7d450787076dbbfbfd6b3fb257..50a2fc430034363ff87039f7c7bb2acf249abfe3 100644
--- a/gpu/command_buffer/service/program_manager.cc
+++ b/gpu/command_buffer/service/program_manager.cc
@@ -693,6 +693,9 @@ void Program::Update() {
   UpdateVertexInputBaseTypes();
   UpdateUniformBlockSizeInfo();
 
+  effective_transform_feedback_buffer_mode_ = transform_feedback_buffer_mode_;
+  effective_transform_feedback_varyings_ = transform_feedback_varyings_;

[Zhenyao Mo, 2016/10/07 21:05:36]

This behavior will also be tested in the webgl2 conformance test suite.

+
   valid_ = true;
 }