PlzNavigate: Move navigation-level mixed content checks to the browser.

content/browser/frame_host/mixed_content_navigation_throttle.h

+// 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 CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
+#define CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/navigation_handle.h"
+#include "content/public/browser/navigation_throttle.h"
+
+namespace content {
+
+class FrameTreeNode;
+
+using ThrottleCheckResult = NavigationThrottle::ThrottleCheckResult;
+
+// Responsible for browser process side mixed-content security. It checks only
+// for frame-level resource loads (aka navigation loads); fetching of
+// sub-resources are checked in the renderer process by MixedContentChecker.
+// Changes to this class might need to be reflected on its renderer counterpart.
+//
+// Current mixed content draft that drives this implementation:
+// https://w3c.github.io/webappsec-mixed-content/
+class MixedContentNavigationThrottle : public NavigationThrottle {
+ public:
+  MixedContentNavigationThrottle(NavigationHandle* navigation_handle);
+  ~MixedContentNavigationThrottle() override;
+
+  ThrottleCheckResult WillStartRequest() override;
+
+  ThrottleCheckResult WillRedirectRequest() override;
+
+  ThrottleCheckResult WillProcessResponse() override;
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(MixedContentNavigationThrottleTest, IsMixedContent);
+
+  // Returns the parent frame where mixed content exists for the provided data
+  // or null if there is no mixed content.
+  FrameTreeNode* InWhichFrameIsContentMixed(FrameTreeNode* node,
+                                            const GURL& url);
+
+  static bool CONTENT_EXPORT IsMixedContentForTesting(const GURL& origin_url,
+                                                      const GURL& url);
+
+  DISALLOW_COPY_AND_ASSIGN(MixedContentNavigationThrottle);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_