[chrome-devtools-frontend] Migrate to cloudstorage client

Import the cloudstorage library into the project to replace deprecated
'files' API.

Change pre_cacher module to populate local Cloud Storage server instead
of the cache.

file_reader module now relies on cloudstorage library's retries mechanism
instead of doing retries on its own.

TBR=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/1150463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/chrome-devtools-frontend@295320 0039d316-1c4b-4281-b951-d872f2087c98
13 files changed
tree: 8e38dce231745ced2caeee55da5d4cb5f7529f54
  1. gae/
  2. gce/
  3. codereview.settings
  4. OWNERS
  5. WATCHLISTS