Add yapf python formatter and format all files

yapf seems widely used in chromium. Adding here and
formatting all existing sources.

Change-Id: I5fd223a46cf3a00e6b7e6266850825b484af1558
diff --git a/tools/run_android_test b/tools/run_android_test
index 7772ddb..27fd273 100755
--- a/tools/run_android_test
+++ b/tools/run_android_test
@@ -22,8 +22,6 @@
 import sys
 import tempfile
 import time
-
-
 """ Runs a test executable on Android.
 
 Takes care of pushing the extra shared libraries that might be required by
@@ -53,7 +51,9 @@
       will be raised and falsy values returned to the caller (except when
       returns_falsy='raise').
   """
+
   def Decorator(f):
+
     @functools.wraps(f)
     def Wrapper(*args, **kwargs):
       wait = 1
@@ -77,7 +77,9 @@
       if returns_falsy == 'raise' and not value:
         raise ValueError('%s returned %r' % (f.__name__, value))
       return value
+
     return Wrapper
+
   return Decorator
 
 
@@ -162,7 +164,7 @@
   if os.path.exists(sanitizer_libs):
     AdbPush(sanitizer_libs, target_dir)
     env += 'LD_LIBRARY_PATH="%s/sanitizer_libs" ' % (target_dir)
-  cmd = 'cd %s;' % target_dir;
+  cmd = 'cd %s;' % target_dir
   binary = env + '/data/nativetest/%s' % args.test_name
   cmd += binary
   if args.cmd_args: