Add base_url to DriveApiUrlGenerator.

chrome/browser/google_apis/drive_api_url_generator.h

Index: chrome/browser/google_apis/drive_api_url_generator.h
diff --git a/chrome/browser/google_apis/drive_api_url_generator.h b/chrome/browser/google_apis/drive_api_url_generator.h
index eb42af88e917be22384918f3f2670575c8700244..e08f895087b987999ff2edc298f0dba0ef85b5a8 100644
--- a/chrome/browser/google_apis/drive_api_url_generator.h
+++ b/chrome/browser/google_apis/drive_api_url_generator.h
@@ -15,11 +15,14 @@ namespace google_apis {
 // servers for production, and a local server for testing.
 class DriveApiUrlGenerator {
  public:
-  // TODO(hidehiko): Pass server name to a constructor in order to inject
-  // server path for testing.
-  DriveApiUrlGenerator();
+  // |base_url| is the path to the target drive api server.
+  // Note that this is an injecting point for a testing server.
+  explicit DriveApiUrlGenerator(const GURL& base_url);
   ~DriveApiUrlGenerator();
 
+  // The base URL for communicating with the production drive api server.
+  static const char kBaseUrlForProduction[];
+
   // Returns a URL to fetch "about" data.
   GURL GetAboutUrl() const;
 
@@ -45,6 +48,9 @@ class DriveApiUrlGenerator {
   // Returns a URL to fecth a file content.
   GURL GetFileUrl(const std::string& file_id) const;
 
+ private:
+  const GURL base_url_;
+
   // This class is copyable hence no DISALLOW_COPY_AND_ASSIGN here.
 };