During image destroy, delete textures only if we have a GL context.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index f4c03d5d5c8ef2ce42c7fef753fefec4630509a5..0f4ac7e41c6cf0648a992d6945c8a836b7f75afe 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -3493,6 +3493,11 @@ void GLES2DecoderImpl::Destroy(bool have_context) {
     vertex_array_manager_.reset();
   }
 
+  if (image_manager_.get()) {
+    image_manager_->Destroy(have_context);
+    image_manager_.reset();
+  }
+
   offscreen_target_frame_buffer_.reset();
   offscreen_target_color_texture_.reset();
   offscreen_target_color_render_buffer_.reset();