Resolve URLs passed on the command line relative to the CWD.

shell/context.h

Index: shell/context.h
diff --git a/shell/context.h b/shell/context.h
index 85d1d67f1748cc7ef888547eb5771219f595d0c2..d672e1ac1bf395c1f09df396b7fee1c39ba88796 100644
--- a/shell/context.h
+++ b/shell/context.h
@@ -35,6 +35,14 @@ class Context : ApplicationManager::Delegate {
   // everything but relative file URLs or URLs without a scheme.
   GURL ResolveShellFileURL(const std::string& path);
 
+  // Override the CWD, which is used for resolving file URLs passed in from the
+  // command line.
+  void SetCommandLineCWD(const base::FilePath& path);
+
+  // Resolve an URL relative to the CWD mojo_shell was invoked from. This is a
+  // nop for everything but relative file URLs or URLs without a scheme.
+  GURL ResolveCommandLineURL(const std::string& path);
+
   static void EnsureEmbedderIsInitialized();
   bool Init();
 
@@ -61,6 +69,7 @@ class Context : ApplicationManager::Delegate {
   ApplicationManager application_manager_;
   MojoURLResolver mojo_url_resolver_;
   GURL shell_file_root_;
+  GURL command_line_cwd_;
 
   DISALLOW_COPY_AND_ASSIGN(Context);
 };