Pull gn binary.

This pulls the Windows and Linux binaries down from Google storage on sync. These aren't hooked up to anything yet, and Mac will come later.

BUG=
R=hinoka@google.com

Review URL: https://codereview.chromium.org/31083008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231440 0039d316-1c4b-4281-b951-d872f2087c98

.gitignore

@@ -305,6 +305,9 @@ v8.log
 /third_party/yasm/yasm.xml
 /tools/deps2git/
 /tools/distcc
+/tools/gn/bin/linux
+/tools/gn/bin/mac
+/tools/gn/bin/win
 /tools/grit
 /tools/gyp
 /tools/histograms

DEPS

@@ -1,3 +1,14 @@
+# This file is automatically processed to create .DEPS.git which is the file
+# that gclient uses under git.
+#
+# See http://code.google.com/p/chromium/wiki/UsingGit
+#
+# To test manually, run:
+#   python tools/deps2git/deps2git.py -o .DEPS.git
+#   gclient runhooks
+# DO NOT CHECK IN CHANGES TO .DEPS.git. It will be automatically updated by
+# a bot when you modify this one.
+#
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 
@@ -606,6 +617,27 @@ hooks = [
                "-s", "src/third_party/WebKit",
                "-o", "src/build/util/LASTCHANGE.blink"],
   },
+  # Pull GN binaries. This needs to be before running GYP below.
+  {
+    "name": "gn_win",
+    "pattern": "\\.sha1$",
+    "action": [ "download_from_google_storage",
+                "--platform=win32",
+                "--directory",
+                "--bucket", "chromium-gn",
+                "src/tools/gn/bin/win",
+    ],
+  },
+  {
+    "name": "gn_linux",
+    "pattern": "\\.sha1$",
+    "action": [ "download_from_google_storage",
+                "--platform=\"linux*\"",
+                "--directory",
+                "--bucket", "chromium-gn",
+                "src/tools/gn/bin/linux",
+    ],
+  },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "name": "gyp",

tools/gn/bin/README.txt

@@ -0,0 +1,26 @@
+This folder contains GN binaries. They should be automatically downloaded from
+Google Storage by gclient runhooks for the current platform.
+
+
+To upload a file:
+  python ~/depot_tools/upload_to_google_storage.py -b chromium-gn <FILENAME>
+
+To download a file given a .sha1 file:
+  python ~/depot_tools/download_from_google_storage.py -b chromium-gn -s <FILENAME>.sha1
+
+List the contents of GN's Google Storage bucket:
+  python ~/depot_tools/third_party/gsutil/gsutil ls gs://chromium-gn/
+
+To initialize gsutil's credentials:
+  python ~/depot_tools/third_party/gsutil/gsutil config
+
+  That will give a URL which you should log into with your web browser. The
+  username should be the one that is on the ACL for the "chromium-gn" bucket
+  (probably your @google.com address). Contact the build team for help getting
+  access if necessary.
+
+  Copy the code back to the command line util. Ignore the project ID (it's OK
+  to just leave blank when prompted).
+
+gsutil documentation:
+  https://developers.google.com/storage/docs/gsutil

tools/gn/bin/linux/gn.sha1

@@ -0,0 +1 @@
+9c71ff30a0781745029d018313783cc814a8c305

tools/gn/bin/win/gn.exe.sha1

@@ -0,0 +1 @@
+afd819eef0c7a347b4021ac47b722e04e9ff3193