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

gpu/command_buffer/service/image_manager.cc

Index: gpu/command_buffer/service/image_manager.cc
diff --git a/gpu/command_buffer/service/image_manager.cc b/gpu/command_buffer/service/image_manager.cc
index 953e3bcb5731b3b98bfaeef8d6b7bae11c96d376..79e62fbc96bd0b2e8970f7c3e4cc37289e5fcccc 100644
--- a/gpu/command_buffer/service/image_manager.cc
+++ b/gpu/command_buffer/service/image_manager.cc
@@ -15,6 +15,13 @@ ImageManager::ImageManager() {
 ImageManager::~ImageManager() {
 }
 
+void ImageManager::Destroy(bool have_context) {
+  for (GLImageMap::const_iterator iter = images_.begin(); iter != images_.end();
+       ++iter)
+    iter->second.get()->Destroy(have_context);
+  images_.clear();
+}
+
 void ImageManager::AddImage(gfx::GLImage* image, int32 service_id) {
   images_[service_id] = image;
 }