Implement GetInitiateUpload{New,Existing}FileUrl on Drive API v2.

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 0e7fd4428cb3764219c9feaf17664fa8655837c9..cb61f02d9d0334ac76526ab40d426cf92ccc6011 100644
--- a/chrome/browser/google_apis/drive_api_url_generator.h
+++ b/chrome/browser/google_apis/drive_api_url_generator.h
@@ -68,6 +68,13 @@ class DriveApiUrlGenerator {
   GURL GetChildrenUrlForRemoval(const std::string& folder_id,
                                 const std::string& child_id) const;
 
+  // Returns a URL to initiate uploading a new file.
+  GURL GetInitiateUploadNewFileUrl() const;
+
+  // Returns a URL to initiate uploading an existing file specified by
+  // |resource_id|.
+  GURL GetInitiateUploadExistingFileUrl(const std::string& resource_id) const;
+
  private:
   const GURL base_url_;