Add ServeLocalDirectory to the shell abstraction.

mojo/devtools/common/devtoolslib/android_shell.py

Index: mojo/devtools/common/devtoolslib/android_shell.py
diff --git a/mojo/devtools/common/devtoolslib/android_shell.py b/mojo/devtools/common/devtoolslib/android_shell.py
index 4bae3de4449c5de79b7ba20bcd41a67d3d93a756..80c87ceaaa1271fbf29595a69a11343234fda336 100644
--- a/mojo/devtools/common/devtoolslib/android_shell.py
+++ b/mojo/devtools/common/devtoolslib/android_shell.py
@@ -142,7 +142,7 @@ class AndroidShell(Shell):
     atexit.register(_UnmapPort)
     return device_port
 
-  def _StartHttpServerForDirectory(self, path, port=0):
+  def _StartHttpServerForDirectory(self, path, device_port=0):
     """Starts an http server serving files from |path|. Returns the local
     url.
     """
@@ -151,7 +151,8 @@ class AndroidShell(Shell):
     server_address = StartHttpServer(path)
 
     print 'local port=%d' % server_address[1]
-    return 'http://127.0.0.1:%d/' % self._MapPort(port, server_address[1])
+    return 'http://127.0.0.1:%d/' % self._MapPort(device_port,
+                                                  server_address[1])
 
   def _StartHttpServerForOriginMapping(self, mapping, port):
     """If |mapping| points at a local file starts an http server to serve files
@@ -223,6 +224,19 @@ class AndroidShell(Shell):
         local_dir, DEFAULT_BASE_PORT if fixed_port else 0)
     return "--origin=" + origin_url
 
+  def ServeLocalDirectory(self, local_dir_path, port=0):
+    """Serves the content of the local (host) directory, making it available to
+    the shell under the url returned by the function.
+
+    The server will run on a separate thread until the program terminates. The
+    call returns immediately.
+
+    Args:
+      local_dir_path: path to the directory to be served
+      port: port at which the server will be available to the shell
+    """
+    return self._StartHttpServerForDirectory(local_dir_path, port)

[qsr, 2015/05/19 13:55:42]

You are just delegatng to a private method -> you should rename the private
method instead.

[ppi, 2015/05/19 14:22:48]

Done.

+
   def StartShell(self,
                  arguments,
                  stdout=None,