Differential updates for components.

chrome/browser/component_updater/component_updater_service.h

Index: chrome/browser/component_updater/component_updater_service.h
diff --git a/chrome/browser/component_updater/component_updater_service.h b/chrome/browser/component_updater/component_updater_service.h
index 3ac645d8a0b0b4f7041aa6fb484680e0369878bd..bf011eb43e022d3940a0b874390ab09923eab858 100644
--- a/chrome/browser/component_updater/component_updater_service.h
+++ b/chrome/browser/component_updater/component_updater_service.h
@@ -20,6 +20,8 @@ class DictionaryValue;
 class FilePath;
 }
 
+class ComponentPatcher;
+
 // Component specific installers must derive from this class and implement
 // OnUpdateError() and Install(). A valid instance of this class must be
 // given to ComponentUpdateService::RegisterComponent().
@@ -37,15 +39,22 @@ class ComponentInstaller {
   virtual bool Install(const base::DictionaryValue& manifest,
                        const base::FilePath& unpack_path) = 0;
 
+  // Set |installed_file| to the full path to the installed |file|. |file| is
+  // the filename of the file in this component's CRX. Returns false if this is
+  // not possible (the file has been removed or modified, or its current
+  // location is unknown). Otherwise, returns true.
+  virtual bool GetInstalledFile(const std::string& file,
+                                base::FilePath* installed_file) = 0;
+
  protected:
   virtual ~ComponentInstaller() {}
 };
 
 // Describes a particular component that can be installed or updated. This
 // structure is required to register a component with the component updater.
-// Only |name| is optional. |pk_hash| is the SHA256 hash of the component's
-// public key. If the component is to be installed then version should be
-// "0" or "0.0", else it should be the current version.
+// |pk_hash| is the SHA256 hash of the component's public key. If the component
+// is to be installed then version should be "0" or "0.0", else it should be
+// the current version. |fingerprint| and |name| are optional.
 // |source| is by default pointing to BANDAID but if needed it can be made
 // to point to the webstore (CWS_PUBLIC) or to the webstore sandbox. It is
 // important to note that the BANDAID source if active throught the day
@@ -55,12 +64,13 @@ struct CrxComponent {
   enum UrlSource {
     BANDAID,
     CWS_PUBLIC,
-    CWS_SANDBOX
+    CWS_SANDBOX,
   };
 
   std::vector<uint8> pk_hash;
   ComponentInstaller* installer;
   Version version;
+  std::string fingerprint;
   std::string name;
   UrlSource source;
   CrxComponent();
@@ -128,6 +138,11 @@ class ComponentUpdateService {
     // happens. It should be used mostly as a place to add application specific
     // logging or telemetry. |extra| is |event| dependent.
     virtual void OnEvent(Events event, int extra) = 0;
+    // Creates a new ComponentPatcher in a platform-specific way. This is useful
+    // for dependency injection.
+    virtual ComponentPatcher* CreateComponentPatcher() = 0;
+    // True means that this client can handle delta updates.
+    virtual bool DeltasEnabled() const = 0;
   };
 
   // Start doing update checks and installing new versions of registered