Adds ability for chrome to behave as mojo_runner

chrome/app/chrome_main.cc

Index: chrome/app/chrome_main.cc
diff --git a/chrome/app/chrome_main.cc b/chrome/app/chrome_main.cc
index 041ecc4004fbd2bbf897e54caf80ef1e55da43f4..0ad602abf0cfccd9dab0605d129817b9bf2dbc9a 100644
--- a/chrome/app/chrome_main.cc
+++ b/chrome/app/chrome_main.cc
@@ -5,8 +5,14 @@
 #include "chrome/app/chrome_main_delegate.h"
 
 #include "build/build_config.h"
+#include "chrome/common/features.h"
 #include "content/public/app/content_main.h"
 
+#if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
+#include "base/command_line.h"
+#include "chrome/app/mash/mash_runner.h"
+#endif
+
 #if defined(OS_WIN)
 #include "base/debug/dump_without_crashing.h"
 #include "base/win/win_util.h"
@@ -64,6 +70,17 @@ int ChromeMain(int argc, const char** argv) {
   params.argv = argv;
 #endif
 
+#if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
+#if !defined(OS_WIN)
+  base::CommandLine::Init(params.argc, params.argv);
+#endif
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+  // TODO(sky): only do this for dev builds and if on canary channel.
+  if (command_line.HasSwitch("mash"))
+    return MashMain();
+#endif
+
   int rv = content::ContentMain(params);
 
 #if defined(OS_WIN)