Allow mojo_runner to connect to arbitrary executables.

mojo/fetcher/url_resolver.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/fetcher/url_resolver.h"
 
 #include "base/base_paths.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/shell/query_util.h"
 #include "mojo/util/filename_util.h"
 #include "url/url_util.h"
 
 namespace mojo {
 namespace fetcher {
 
 URLResolver::URLResolver(const GURL& mojo_base_url)
     : mojo_base_url_(util::AddTrailingSlashIfNeeded(mojo_base_url)) {
   DCHECK(mojo_base_url_.is_valid());
   // Needed to treat first component of mojo URLs as host, not path.
   url::AddStandardScheme("mojo", url::SCHEME_WITHOUT_AUTHORITY);
+  url::AddStandardScheme("exe", url::SCHEME_WITHOUT_AUTHORITY);
 }
 
 URLResolver::~URLResolver() {
 }
 
 GURL URLResolver::ResolveMojoURL(const GURL& mojo_url) const {
-  if (mojo_url.scheme() != "mojo") {
+  if (mojo_url.SchemeIs("mojo")) {
+    // It's still a mojo: URL, use the default mapping scheme.
+    std::string query;
+    GURL base_url = shell::GetBaseURLAndQuery(mojo_url, &query);
+    const std::string host = base_url.host();
+    return mojo_base_url_.Resolve(host + "/" + host + ".mojo" + query);
+  } else if (mojo_url.SchemeIs("exe")) {
+#if defined OS_WIN
+    std::string extension = ".exe";
+#else
+    std::string extension;
+#endif
+    std::string query;
+    GURL base_url = shell::GetBaseURLAndQuery(mojo_url, &query);
+    return mojo_base_url_.Resolve(base_url.host() + extension);
+  } else {
     // The mapping has produced some sort of non-mojo: URL - file:, http:, etc.
     return mojo_url;
   }
-
-  // It's still a mojo: URL, use the default mapping scheme.
-  std::string query;
-  GURL base_url = shell::GetBaseURLAndQuery(mojo_url, &query);
-  const std::string host = base_url.host();
-  return mojo_base_url_.Resolve(host + "/" + host + ".mojo" + query);
 }
 
 }  // namespace fetcher
 }  // namespace mojo