Allow callers of CommandLine::Init to know whether they were the first caller.

base/command_line.cc

Index: base/command_line.cc
diff --git a/base/command_line.cc b/base/command_line.cc
index 0237ffeb104509dfa91653cf231d2b90ba75dff7..530941e787fb52f9e6c68ad4e7e488d6d41ef409 100644
--- a/base/command_line.cc
+++ b/base/command_line.cc
@@ -167,12 +167,12 @@ CommandLine::~CommandLine() {
 }
 
 // static
-void CommandLine::Init(int argc, const char* const* argv) {
+bool CommandLine::Init(int argc, const char* const* argv) {
   if (current_process_commandline_) {
     // If this is intentional, Reset() must be called first. If we are using
     // the shared build mode, we have to share a single object across multiple
     // shared libraries.
-    return;
+    return false;
   }
 
   current_process_commandline_ = new CommandLine(NO_PROGRAM);
@@ -181,6 +181,8 @@ void CommandLine::Init(int argc, const char* const* argv) {
 #elif defined(OS_POSIX)
   current_process_commandline_->InitFromArgv(argc, argv);
 #endif
+
+  return true;
 }
 
 // static