Content Settings: Add RevocationObserver to measure when permissions are revoked

chrome/browser/content_settings/content_settings_mock_observer.h

Index: chrome/browser/content_settings/content_settings_mock_observer.h
diff --git a/chrome/browser/content_settings/content_settings_mock_observer.h b/chrome/browser/content_settings/content_settings_mock_observer.h
index 0d9989f2b259ead1331e994b6a0753cd507e0eb0..c65c9f7e38e00d05433c3fdc718cfd4156927fdf 100644
--- a/chrome/browser/content_settings/content_settings_mock_observer.h
+++ b/chrome/browser/content_settings/content_settings_mock_observer.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
 #include "testing/gmock/include/gmock/gmock.h"
+#include "url/gurl.h"
 
 namespace content_settings {
 
@@ -27,6 +28,25 @@ class MockObserver : public Observer {
   DISALLOW_COPY_AND_ASSIGN(MockObserver);
 };
 
+class MockRevocationObserver : public Observer {
+ public:
+  MockRevocationObserver();
+  virtual ~MockRevocationObserver();
+
+  void OnContentSettingChanged(const ContentSettingsPattern& primary_pattern,
+                    const ContentSettingsPattern& secondary_pattern,
+                    ContentSettingsType content_type,
+                    std::string resource_identifier);
+
+  MOCK_METHOD4(OnContentSettingRevoked,
+               void(const GURL&,
+                    const GURL&,
+                    ContentSettingsType,
+                    std::string));
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockRevocationObserver);
+};
+
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_MOCK_OBSERVER_H_