Patch Portage 2.1.9.45 with patches from cros-2.1.9 branch.

sys-apps/portage/files/portage-2.1.9.45-fastbuild.patch

Index: sys-apps/portage/files/portage-2.1.9.45-fastbuild.patch
diff --git a/sys-apps/portage/files/portage-2.1.9.45-fastbuild.patch b/sys-apps/portage/files/portage-2.1.9.45-fastbuild.patch
new file mode 100644
index 0000000000000000000000000000000000000000..2936ad4fe8ca49146e9945782b4dd2ccffb70b3f
--- /dev/null
+++ b/sys-apps/portage/files/portage-2.1.9.45-fastbuild.patch
@@ -0,0 +1,46 @@
+commit 89e9b53262f714aa8f8ce9128a95919935808b41
+Author: David James <davidjames@google.com>
+Date:   Wed Jan 26 11:43:11 2011 -0800
+
+    Commit fast-build patch to portage_tool repository.
+    
+    This patch allows us to selectively disable Portage locks in parallel_emerge.
+    It is not intended to be upstreamed but is left in for now until we find a way
+    to replace it (e.g. by integrating parallel emerge support directly into portage
+    itself).
+    
+    Change-Id: I4ea50e206102b249ba01d2f760ebaba221bddd18
+    
+    BUG=chromium-os:11324
+    TEST=build_packages --nousepkg
+    
+    Review URL: http://codereview.chromium.org/6377009
+
+diff --git a/pym/portage/dbapi/vartree.py b/pym/portage/dbapi/vartree.py
+index f169e39..7856c85 100644
+--- a/pym/portage/dbapi/vartree.py
++++ b/pym/portage/dbapi/vartree.py
+@@ -1289,14 +1289,15 @@ class dblink(object):
+ 			raise AssertionError("Lock already held.")
+ 		# At least the parent needs to exist for the lock file.
+ 		ensure_dirs(self.dbroot)
+-		if self._scheduler is None:
+-			self._lock_vdb = lockdir(self.dbroot)
+-		else:
+-			async_lock = AsynchronousLock(path=self.dbroot,
+-				scheduler=self._scheduler)
+-			async_lock.start()
+-			async_lock.wait()
+-			self._lock_vdb = async_lock
++		if os.environ.get("PORTAGE_LOCKS") != "false":
++			if self._scheduler is None:
++				self._lock_vdb = lockdir(self.dbroot)
++			else:
++				async_lock = AsynchronousLock(path=self.dbroot,
++					scheduler=self._scheduler)
++				async_lock.start()
++				async_lock.wait()
++				self._lock_vdb = async_lock
+ 
+ 	def unlockdb(self):
+ 		if self._lock_vdb is not None: