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 b5bb3f491f070688914d8f2f8146969509e341db..b7f6914361d8b8ed09639dd6b90b5d5a8d832e44 100644
--- a/content/browser/child_process_launcher.cc
+++ b/content/browser/child_process_launcher.cc
@@ -38,6 +38,7 @@
 #endif
 
 #if defined(OS_POSIX)
+#include "base/metrics/stats_table.h"
 #include "base/posix/global_descriptors.h"
 #endif
 
@@ -207,6 +208,12 @@ class ChildProcessLauncher::Context
     files_to_register.push_back(
         FileDescriptorInfo(kPrimaryIPCChannel,
                                     base::FileDescriptor(ipcfd, false)));
+    base::StatsTable* stats_table;
+    if ((stats_table = base::StatsTable::current()) != NULL) {

[jar (doing other things), 2013/08/21 01:09:46]

nit: initialize during the definition, rather than in an if() statement.

[rmcilroy, 2013/08/21 10:37:16]

Done.

+      files_to_register.push_back(
+          FileDescriptorInfo(kStatsTableSharedMemFd,
+                                      stats_table->GetSharedMemoryHandle()));

[jar (doing other things), 2013/08/21 01:09:46]

nit: indent: align under first argument.

[rmcilroy, 2013/08/21 10:37:16]

I was copying line 210 above.  I've now changed both lines to indent with first
arg.

+    }
 
     GetContentClient()->browser()->
         GetAdditionalMappedFilesForChildProcess(*cmd_line, child_process_id,
@@ -228,7 +235,12 @@ class ChildProcessLauncher::Context
     files_to_register.push_back(
         FileDescriptorInfo(kPrimaryIPCChannel,
                                     base::FileDescriptor(ipcfd, false)));
-
+    base::StatsTable* stats_table;
+    if ((stats_table = base::StatsTable::current()) != NULL) {

[jar (doing other things), 2013/08/21 01:09:46]

nit: initialize in definition, rather than during if().

[rmcilroy, 2013/08/21 10:37:16]

Done.

+      files_to_register.push_back(
+          FileDescriptorInfo(kStatsTableSharedMemFd,
+                                      stats_table->GetSharedMemoryHandle()));

[jar (doing other things), 2013/08/21 01:09:46]

nit: indent

[rmcilroy, 2013/08/21 10:37:16]

Done.

+    }
 #if !defined(OS_MACOSX)
     GetContentClient()->browser()->
         GetAdditionalMappedFilesForChildProcess(*cmd_line, child_process_id,