Pass StatsTable shared memory via global descriptors on Posix rather than using named shared memory.

content/browser/child_process_launcher.cc

Index: content/browser/child_process_launcher.cc
diff --git a/content/browser/child_process_launcher.cc b/content/browser/child_process_launcher.cc
index 721cd5a88ede6cc6eeb7907bdecbfd35b7a5ff6d..3b95c14dc65d2f9aa0d52a074ff2d079e3946664 100644
--- a/content/browser/child_process_launcher.cc
+++ b/content/browser/child_process_launcher.cc
@@ -32,6 +32,7 @@
 #include "base/android/jni_android.h"
 #include "content/browser/android/child_process_launcher_android.h"
 #elif defined(OS_POSIX)
+#include "base/memory/shared_memory.h"
 #include "base/memory/singleton.h"
 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
@@ -39,6 +40,7 @@
 #endif
 
 #if defined(OS_POSIX)
+#include "base/metrics/stats_table.h"
 #include "base/posix/global_descriptors.h"
 #endif
 
@@ -197,17 +199,27 @@ class ChildProcessLauncher::Context
 #if defined(OS_WIN)
     scoped_ptr<SandboxedProcessLauncherDelegate> delegate_deleter(delegate);
     base::ProcessHandle handle = StartSandboxedProcess(delegate, cmd_line);
-#elif defined(OS_ANDROID)
-    // Android WebView runs in single process, ensure that we never get here
-    // when running in single process mode.
-    CHECK(!cmd_line->HasSwitch(switches::kSingleProcess));
-
+#elif defined(OS_POSIX)
     std::string process_type =
         cmd_line->GetSwitchValueASCII(switches::kProcessType);
     std::vector<FileDescriptorInfo> files_to_register;
     files_to_register.push_back(
         FileDescriptorInfo(kPrimaryIPCChannel,
-                                    base::FileDescriptor(ipcfd, false)));
+                           base::FileDescriptor(ipcfd, false)));
+    base::StatsTable* stats_table = base::StatsTable::current();
+    if (stats_table &&
+        base::SharedMemory::IsHandleValid(
+            stats_table->GetSharedMemoryHandle())) {
+      files_to_register.push_back(
+          FileDescriptorInfo(kStatsTableSharedMemFd,
+                             stats_table->GetSharedMemoryHandle()));
+    }
+#endif
+
+#if defined(OS_ANDROID)
+    // Android WebView runs in single process, ensure that we never get here
+    // when running in single process mode.
+    CHECK(!cmd_line->HasSwitch(switches::kSingleProcess));
 
     GetContentClient()->browser()->
         GetAdditionalMappedFilesForChildProcess(*cmd_line, child_process_id,
@@ -223,13 +235,6 @@ class ChildProcessLauncher::Context
     // child termination.
     file_util::ScopedFD ipcfd_closer(&ipcfd);
 
-    std::string process_type =
-        cmd_line->GetSwitchValueASCII(switches::kProcessType);
-    std::vector<FileDescriptorInfo> files_to_register;
-    files_to_register.push_back(
-        FileDescriptorInfo(kPrimaryIPCChannel,
-                                    base::FileDescriptor(ipcfd, false)));
-
 #if !defined(OS_MACOSX)
     GetContentClient()->browser()->
         GetAdditionalMappedFilesForChildProcess(*cmd_line, child_process_id,