gpu: Fix some context lost marking glitches+leaks and add UMA stats

gpu/command_buffer/tests/gl_manager.cc

Index: gpu/command_buffer/tests/gl_manager.cc
diff --git a/gpu/command_buffer/tests/gl_manager.cc b/gpu/command_buffer/tests/gl_manager.cc
index 8988349eaa4be81a22f38e1b44edd5c6d2e46d01..23779ea8f3041b6ac59ac734ad5f0bd228b03cba 100644
--- a/gpu/command_buffer/tests/gl_manager.cc
+++ b/gpu/command_buffer/tests/gl_manager.cc
@@ -404,8 +404,8 @@ void GLManager::Destroy() {
   gles2_helper_.reset();
   command_buffer_.reset();
   if (decoder_.get()) {
-    decoder_->MakeCurrent();
-    decoder_->Destroy(true);
+    bool have_context = decoder_->GetGLContext()->MakeCurrent(surface_.get());
+    decoder_->Destroy(have_context);
     decoder_.reset();
   }
 }