Add ContentSettingsProvider Interface.

chrome/browser/content_settings/content_settings_provider.h

Index: chrome/browser/content_settings/content_settings_provider.h
diff --git a/chrome/browser/content_settings/content_settings_provider.h b/chrome/browser/content_settings/content_settings_provider.h
index e791eaddade8f36ac72730fd3a733fcc4805e030..1c8adc5087209e6a9b02f85d9b533104da5ce067 100644
--- a/chrome/browser/content_settings/content_settings_provider.h
+++ b/chrome/browser/content_settings/content_settings_provider.h
@@ -8,8 +8,14 @@
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_
 #pragma once
 
+#include "chrome/browser/content_settings/content_settings_pattern.h"
+#include "chrome/browser/content_settings/content_settings_rule.h"
 #include "chrome/common/content_settings.h"
 
+class GURL;
+
+namespace content_settings {
+
 class DefaultContentSettingsProvider {
  public:
   virtual ~DefaultContentSettingsProvider() {}
@@ -39,4 +45,36 @@ class DefaultContentSettingsProvider {
       ContentSettingsType content_type) const = 0;
 };
 
+class ContentSettingsProvider {
+ public:
+  typedef std::string ResourceIdentifier;
+  typedef std::pair<ContentSettingsType, ResourceIdentifier> ContentIdentifier;
+
+  virtual ~ContentSettingsProvider() {}
+
+  // This may be called on any thread.
+  virtual ContentSetting GetContentSetting(
+      const GURL requesting_url,
+      const GURL embedding_url,
+      const ContentIdentifier& content_identifier) const = 0;
+
+  // This should only be called on the UI thread.
+  virtual void SetContentSetting(
+      const ContentSettingsPattern& requesting_pattern,
+      const ContentSettingsPattern& embedding_pattern,
+      const ContentIdentifier& content_identifier,
+      ContentSetting content_setting) = 0;
+
+  // This may be called on any thread.
+  virtual void GetAllContentSettingsRules(
+      const ContentIdentifier& content_identifier,
+      ContentSettingsRules* content_setting_rules) const = 0;
+
+  // This should only be called on the UI thread.
+  virtual void ClearAllContentSettingsRules(
+      const ContentIdentifier& content_identifier) = 0;
+};
+
+}  // namespace content_settings
+
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_