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

content/browser/frame_host/mixed_content_navigation_throttle.h

Index: content/browser/frame_host/mixed_content_navigation_throttle.h
diff --git a/content/browser/frame_host/mixed_content_navigation_throttle.h b/content/browser/frame_host/mixed_content_navigation_throttle.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d7ca60b643aa9c620b1ba90555ee1af1318d3eb
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+++ b/content/browser/frame_host/mixed_content_navigation_throttle.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 CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
+#define CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
+
+#include <set>
+
+#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"
+#include "content/public/common/request_context_type.h"
+#include "third_party/WebKit/public/platform/WebMixedContent.h"
+
+namespace content {
+
+class FrameTreeNode;
+struct WebPreferences;
+
+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);
+
+  // Copy of all mixed content related values from the blink::UseCounter enum.
+  enum UseCounterFeature {
+    MixedContentFormsSubmitted = 441,
+    MixedContentPrivateHostnameInPublicHostname = 530,
+    MixedContentPresent = 609,
+    MixedContentBlockable = 610,
+    MixedContentAudio = 611,
+    MixedContentDownload = 612,
+    MixedContentFavicon = 613,
+    MixedContentImage = 614,
+    MixedContentInternal = 615,
+    MixedContentPlugin = 616,
+    MixedContentPrefetch = 617,
+    MixedContentVideo = 618,
+    MixedContentInNonHTTPSFrameThatRestrictsMixedContent = 661,
+    MixedContentInSecureFrameThatDoesNotRestrictMixedContent = 662,
+    MixedContentWebSocket = 663,
+    MixedContentFormPresent = 665,
+    MixedContentBlockableAllowed = 896,
+    BlockableMixedContentInSubframeBlocked = 966,
+  };
+
+  // Checks if a navigation should be blocked or not due to mixed content.
+  bool ShouldBlockNavigation(bool for_redirect);
+
+  // 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);
+
+  // Updates the renderer if any Blink features were used.
+  void MaybeSendBlinkFeatureUsageReport();
+
+  // Reports basic mixed content features when any kinds of mixed is found.
+  void ReportBasicMixedContentFeatures(
+      RequestContextType request_context_type,
+      blink::WebMixedContent::ContextType mixed_content_context_type,
+      const WebPreferences& prefs);
+
+  static bool CONTENT_EXPORT IsMixedContentForTesting(const GURL& origin_url,
+                                                      const GURL& url);
+
+  // Keeps track of mixed content features (as defined in UseCounter)
+  // encountered while running one of the navigation throttling steps. These
+  // values are reported to the respective renderer process once mixed content
+  // checking is finished.
+  std::set<int> mixed_content_features_;
+
+  DISALLOW_COPY_AND_ASSIGN(MixedContentNavigationThrottle);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_