Prepare for using GYP build on buildbots

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
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+# Note: The buildbots evaluate this file with CWD set to the parent
+# directory and assume that the root of the checkout is in ./v8/, so
+# all paths in here must match this assumption.
+
+deps = {
+  # Remember to keep the revision in sync with the Makefile.
+  "v8/build/gyp":
+    "http://gyp.googlecode.com/svn/trunk@1282",
+}
+
+deps_os = {
+  "win": {
+    "v8/third_party/cygwin":
+      "http://src.chromium.org/svn/trunk/deps/third_party/cygwin@66844",
+
+    "v8/third_party/python_26":
+      "http://src.chromium.org/svn/trunk/tools/third_party/python_26@89111",
+  }
+}
+
+hooks = [
+  {
+    # A change to a .gyp, .gypi, or to GYP itself should run the generator.
+    "pattern": ".",
+    "action": ["python", "v8/build/gyp_v8"],
+  },
+]