blimp: Update animation policy for images on the blimp engine.

blimp/engine/app/engine_settings.h

Index: blimp/engine/app/engine_settings.h
diff --git a/blimp/engine/app/engine_settings.h b/blimp/engine/app/engine_settings.h
index 99d5663a4a2c7a3d741c07de849a48290d8267d2..26fa779a91f2577b17de05386b69486bfe1a0510 100644
--- a/blimp/engine/app/engine_settings.h
+++ b/blimp/engine/app/engine_settings.h
@@ -5,16 +5,26 @@
 #ifndef BLIMP_ENGINE_APP_ENGINE_SETTINGS_H_
 #define BLIMP_ENGINE_APP_ENGINE_SETTINGS_H_
 
+#include "content/public/common/web_preferences.h"
+
 namespace blimp {
 namespace engine {
 
+// The EngineSettings includes all parameters which are configured for the
+// BlimpEngine and can be set by the client. This includes the values for
+// content::WebPreferences which override the default values.
 struct EngineSettings {
+  EngineSettings() {}
+
   // -------WebPreferences-------
-  bool record_whole_document;
+  // These members mirror the parameters in content::WebPreferences. See
+  // content/public/common/web_preferences.h for details.
+
+  bool record_whole_document = false;
 
-  EngineSettings();
-  EngineSettings(const EngineSettings& other);
-  ~EngineSettings();
+  // Disable animation in images by default.
+  content::ImageAnimationPolicy animation_policy =
+      content::ImageAnimationPolicy::IMAGE_ANIMATION_POLICY_NO_ANIMATION;
 };
 
 }  // namespace engine