cros gdata: implement protocol handler for viewing gdata files

- this re-implements the previous implementation of chrome://gdata
- create new scheme gdata:// to view contents of gdata files
- url has format gdata://viewfile/<gdata_resource_id>/<gdata_file_name>
- add gdata protocol handler as a hostname filter for url requests during
  initialization of GDataFileSystem, and remove it in destructor
- reading of file contents is done in streaming manner, without the need to
  store entire file contents in memory before responding to url request
- this also mitigates (if not fixes) the security risk imposed by chrome://
  scheme

BUG=chromium-os:28510,chromium-os:29238
TEST=make sure google docs acct has a text file, open file manager, expand Google Docs, double-click on the txt file, new tab should open with file contents

Review URL: https://chromiumcodereview.appspot.com/10038039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133014 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 1 deletions

diff --git a/chrome/common/url_constants.h b/chrome/common/url_constants.h
index 4ee5682d..ddb5dfc 100644
--- a/chrome/common/url_constants.h
+++ b/chrome/common/url_constants.h
@@ -195,7 +195,6 @@ extern const char kChromeUIActiveDownloadsHost[];
 extern const char kChromeUIChooseMobileNetworkHost[];
 extern const char kChromeUICryptohomeHost[];
 extern const char kChromeUIDiscardsHost[];
-extern const char kChromeUIGDataHost[];
 extern const char kChromeUIIdleLogoutDialogHost[];
 extern const char kChromeUIImageBurnerHost[];
 extern const char kChromeUIKeyboardOverlayHost[];
@@ -344,6 +343,9 @@ extern int kNumberOfChromeDebugURLs;
 
 // Canonical schemes you can use as input to GURL.SchemeIs().
 extern const char kExtensionScheme[];
+#if defined(OS_CHROMEOS)
+extern const char kGDataScheme[];
+#endif  // defined(OS_CHROMEOS)
 
 // Call near the beginning of startup to register Chrome's internal URLs that
 // should be parsed as "standard" with the googleurl library.