Skeleton of the Safe Browsing Subresource Filter.

components/subresource_filter/content/renderer/subresource_filter_agent.h

Index: components/subresource_filter/content/renderer/subresource_filter_agent.h
diff --git a/components/subresource_filter/content/renderer/subresource_filter_agent.h b/components/subresource_filter/content/renderer/subresource_filter_agent.h
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_SUBRESOURCE_FILTER_CONTENT_RENDERER_SUBRESOURCE_FILTER_AGENT_H_
+#define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_RENDERER_SUBRESOURCE_FILTER_AGENT_H_
+
+#include "base/macros.h"
+#include "components/subresource_filter/core/common/activation_state.h"
+#include "content/public/renderer/render_frame_observer.h"
+
+namespace subresource_filter {
+
+// The renderer-side agent of the ContentSubresourceFilterDriver. There is one
+// instance per RenderFrame, responsible for setting up the subresource filter
+// for the ongoing provisional document load in the frame when instructed to do
+// so by the driver.
+class SubresourceFilterAgent : public content::RenderFrameObserver {
+ public:
+  explicit SubresourceFilterAgent(content::RenderFrame* render_frame);
+  ~SubresourceFilterAgent() override;
+
+ private:
+  // content::RenderFrameObserver:
+  void DidStartProvisionalLoad() override;
+  void DidCommitProvisionalLoad(bool is_new_navigation,
+                                bool is_same_page_navigation) override;
+
+  // content::RenderFrameObserver:
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+  void OnActivateForProvisionalLoad(ActivationState activation_state);
+
+  ActivationState activation_state_for_provisional_load_;
+
+  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterAgent);
+};
+
+}  // namespace subresource_filter
+
+#endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_RENDERER_SUBRESOURCE_FILTER_AGENT_H_