Add hooks to get the GN binaries in buildtools.

DEPS

 # 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 -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of "src").
 #
@@ skipping 644 matching lines @@
   },
   # Pull GN binaries. This needs to be before running GYP below.
   {
     "name": "gn_win",
     "pattern": ".",
     "action": [ "download_from_google_storage",
                 "--no_resume",
                 "--platform=win32",
                 "--no_auth",
                 "--bucket", "chromium-gn",
-                "-s", "src/tools/gn/bin/win/gn.exe.sha1",
+                "-s", "src/buildtools/win/gn.exe.sha1",
     ],
   },
   {
     "name": "gn_mac",
     "pattern": ".",
     "action": [ "download_from_google_storage",
                 "--no_resume",
                 "--platform=darwin",
                 "--no_auth",
                 "--bucket", "chromium-gn",
+                "-s", "src/buildtools/mac/gn.sha1",
+    ],
+  },
+  {
+    "name": "gn_linux32",
+    "pattern": ".",
+    "action": [ "download_from_google_storage",
+                "--no_resume",
+                "--platform=linux*",
+                "--no_auth",
+                "--bucket", "chromium-gn",
+                "-s", "src/buildtools/linux32/gn.sha1",
+    ],
+  },
+  {
+    "name": "gn_linux64",
+    "pattern": ".",
+    "action": [ "download_from_google_storage",
+                "--no_resume",
+                "--platform=linux*",
+                "--no_auth",
+                "--bucket", "chromium-gn",
+                "-s", "src/buildtools/linux64/gn.sha1",
+    ],
+  },
+  # Pull GN binaries (old location). TODO(brettw) remove this after a transition
+  # period while we move the binaries from tools/gn/bin to buildtools.
+  {
+    "name": "gn_old_win",
+    "pattern": ".",
+    "action": [ "download_from_google_storage",
+                "--no_resume",
+                "--platform=win32",
+                "--no_auth",
+                "--bucket", "chromium-gn",
+                "-s", "src/tools/gn/bin/win/gn.exe.sha1",
+    ],
+  },
+  {
+    "name": "gn_old_mac",
+    "pattern": ".",
+    "action": [ "download_from_google_storage",
+                "--no_resume",
+                "--platform=darwin",
+                "--no_auth",
+                "--bucket", "chromium-gn",
                 "-s", "src/tools/gn/bin/mac/gn.sha1",
     ],
   },
   {
-    "name": "gn_linux",
+    "name": "gn_old_linux",
     "pattern": ".",
     "action": [ "download_from_google_storage",
                 "--no_resume",
                 "--platform=linux*",
                 "--no_auth",
                 "--bucket", "chromium-gn",
                 "-s", "src/tools/gn/bin/linux/gn.sha1",
     ],
   },
   {
-    "name": "gn_linux32",
+    "name": "gn_old_linux32",
     "pattern": ".",
     "action": [ "download_from_google_storage",
                 "--no_resume",
                 "--platform=linux*",
                 "--no_auth",
                 "--bucket", "chromium-gn",
                 "-s", "src/tools/gn/bin/linux/gn32.sha1",
     ],
   },
   # Pull clang-format binaries using checked-in hashes.
@@ skipping 89 matching lines @@
                 "src/third_party/apache-win32",
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "name": "gyp",
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]