[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 4d7d0b0020454018821f285ad4f4acc21a7202ef..d59245c84544f58642bb03a08e85571dd406032c 100644
--- a/build/android/pylib/utils/md5sum.py
+++ b/build/android/pylib/utils/md5sum.py
@@ -34,9 +34,11 @@ def CalculateHostMd5Sums(paths):
   if isinstance(paths, basestring):
     paths = [paths]
 
-  out = cmd_helper.GetCmdOutput(
-      [os.path.join(constants.GetOutDirectory(), 'md5sum_bin_host')] +
-          [p for p in paths])
+  md5sum_bin_host_path = os.path.join(
+      constants.GetOutDirectory(), 'md5sum_bin_host')
+  if not os.path.exists(md5sum_bin_host_path):
+    raise IOError('File not built: %s' % md5sum_bin_host_path)
+  out = cmd_helper.GetCmdOutput([md5sum_bin_host_path] + [p for p in paths])
 
   return _ParseMd5SumOutput(out.splitlines())
 
@@ -53,9 +55,10 @@ def CalculateDeviceMd5Sums(paths, device):
     paths = [paths]
 
   if not device.FileExists(MD5SUM_DEVICE_BIN_PATH):
-    device.adb.Push(
-        os.path.join(constants.GetOutDirectory(), 'md5sum_dist'),
-        MD5SUM_DEVICE_LIB_PATH)
+    md5sum_dist_path = os.path.join(constants.GetOutDirectory(), 'md5sum_dist')
+    if not os.path.exists(md5sum_dist_path):
+      raise IOError('File not built: %s' % md5sum_dist_path)
+    device.adb.Push(md5sum_dist_path, MD5SUM_DEVICE_LIB_PATH)
 
   out = []