Adding the --load-component-extension flag.

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index 30c73a5822f240339cc5ee61bd71d2964f562ea8..3ab55880f759ca9e05622be5a02ca8b418425d3d 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -12,6 +12,7 @@
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
+#include "base/string_tokenizer.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_classifier.h"
@@ -417,6 +418,15 @@ void ProfileImpl::InitExtensions(bool extensions_enabled) {
       extensions_enabled));
 
   extension_service_->component_loader()->AddDefaultComponentExtensions();
+  if (command_line->HasSwitch(switches::kLoadComponentExtension)) {
+    std::string path_list = command_line->GetSwitchValueASCII(
+        switches::kLoadComponentExtension);
+    StringTokenizer t(path_list, ",");
+    while (t.GetNext()) {
+      extension_service_->component_loader()->AddFromCommandLine(
+          FilePath(t.token()));
+    }
+  }
   extension_service_->Init();
 
   if (extensions_enabled) {