Native memory histograms for the browser.

content/common/child_process_messages.h

Index: content/common/child_process_messages.h
diff --git a/content/common/child_process_messages.h b/content/common/child_process_messages.h
index 0cf2a3a69499358e9413cc40b62b3a0cac47a0fe..7133bf59148b81d0e2b47f41c42fff085a4b829b 100644
--- a/content/common/child_process_messages.h
+++ b/content/common/child_process_messages.h
@@ -108,6 +108,11 @@ IPC_MESSAGE_CONTROL2(ChildProcessHostMsg_ChildHistogramData,
                      int, /* sequence_number */
                      std::vector<std::string> /* histogram_data */)
 
+// Request a histogram from the browser.

[Charlie Reis, 2013/01/22 23:31:31]

nit: Please mention that this is only available behind the memory metrics flag
here (since I had the same concern as Tom about leaking data if that ever
changed).

[marja, 2013/01/23 08:28:44]

Done.

+IPC_SYNC_MESSAGE_CONTROL1_1(ChildProcessHostMsg_GetBrowserHistogram,
+                            std::string, /* histogram_name */
+                            std::string /* histogram_json */)
+
 // Reply to ChildProcessMsg_DumpHandles when handle table dump is complete.
 IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_DumpHandlesDone)