[Android] DeviceUtils change to make Install work without md5 binary.

build/android/pylib/utils/md5sum.py

Index: build/android/pylib/utils/md5sum.py
diff --git a/build/android/pylib/utils/md5sum.py b/build/android/pylib/utils/md5sum.py
index da3cd15c785b0da5a2382816078d6817f63fc7aa..9d9d3caa50cfad65e71b6aa8190ced2d2a4a1475 100644
--- a/build/android/pylib/utils/md5sum.py
+++ b/build/android/pylib/utils/md5sum.py
@@ -33,9 +33,13 @@ def CalculateHostMd5Sums(paths):
   if isinstance(paths, basestring):
     paths = [paths]
 
+  md5sum_bin_host_path = os.path.join(
+      constants.GetOutDirectory(), 'md5sum_bin_host')
+  if not os.path.exists(md5sum_bin_host_path):
+    raise OSError('File not built: %s' % md5sum_bin_host_path)
+
   out = cmd_helper.GetCmdOutput(
-      [os.path.join(constants.GetOutDirectory(), 'md5sum_bin_host')] +
-          [p for p in paths])
+      [md5sum_bin_host_path] + [p for p in paths])
   return [HashAndPath(*l.split(None, 1)) for l in out.splitlines()]
 
 
@@ -50,10 +54,12 @@ def CalculateDeviceMd5Sums(paths, device):
   if isinstance(paths, basestring):
     paths = [paths]
 
+  md5sum_dist_path = os.path.join(constants.GetOutDirectory(), 'md5sum_dist')
+  if not os.path.exists(md5sum_dist_path):
+    raise OSError('File not built: %s' % md5sum_dist_path)
+
   if not device.FileExists(MD5SUM_DEVICE_BIN_PATH):
-    device.adb.Push(
-        os.path.join(constants.GetOutDirectory(), 'md5sum_dist'),
-        MD5SUM_DEVICE_LIB_PATH)
+    device.adb.Push(md5sum_dist_path, MD5SUM_DEVICE_LIB_PATH)
 
   out = []