Histograms - Support histograms for Plugins, GPU

content/common/child_process_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Common IPC messages used for child processes.
 // Multiply-included message file, hence no include guard.
 
+#include <string>
+#include <vector>
+
 #include "base/shared_memory.h"
 #include "base/tracked_objects.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_macros.h"
 
 IPC_ENUM_TRAITS(tracked_objects::ThreadData::Status)
 
 IPC_STRUCT_TRAITS_BEGIN(tracked_objects::LocationSnapshot)
@@ skipping 62 matching lines @@
 // Sent to all child processes to get trace buffer fullness.
 IPC_MESSAGE_CONTROL0(ChildProcessMsg_GetTraceBufferPercentFull)
 
 // Tell the child process to enable or disable the profiler status.
 IPC_MESSAGE_CONTROL1(ChildProcessMsg_SetProfilerStatus,
                      tracked_objects::ThreadData::Status /* profiler status */)
 
 // Send to all the child processes to send back profiler data (ThreadData in
 // tracked_objects).
 IPC_MESSAGE_CONTROL1(ChildProcessMsg_GetChildProfilerData,
                      int /* sequence number */)

[jam, 2012/06/07 03:34:33]

nit: the convention is to put the parameter name from the dispatching function
here, so sequence_number. also below

[ramant (doing other things), 2012/06/07 23:39:25]

Done.

 
+// Send to all the child processes to send back histogram data.
+IPC_MESSAGE_CONTROL1(ChildProcessMsg_GetChildHistogramData,
+                     int /* sequence number */)
+
 // Sent to child processes to dump their handle table.
 IPC_MESSAGE_CONTROL0(ChildProcessMsg_DumpHandles)
 
 #if defined(USE_TCMALLOC)
 // Sent to child process to request tcmalloc stats.
 IPC_MESSAGE_CONTROL0(ChildProcessMsg_GetTcmallocStats)
 #endif
 
 ////////////////////////////////////////////////////////////////////////////////
 // Messages sent from the child process to the browser.
@@ skipping 16 matching lines @@
 
 // Reply to ChildProcessMsg_GetTraceBufferPercentFull.
 IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_TraceBufferPercentFullReply,
                      float /*trace buffer percent full*/)
 
 // Send back profiler data (ThreadData in tracked_objects).
 IPC_MESSAGE_CONTROL2(ChildProcessHostMsg_ChildProfilerData,
                      int, /* sequence number */
                      tracked_objects::ProcessDataSnapshot /* profiler data */)
 
+// Send back histograms as vector of pickled-histogram strings.
+IPC_MESSAGE_CONTROL2(ChildProcessHostMsg_ChildHistogramData,
+                     int, /* sequence number */
+                     std::vector<std::string> /* histogram data */)
+
 // Reply to ChildProcessMsg_DumpHandles when handle table dump is complete.
 IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_DumpHandlesDone)
 
 #if defined(OS_WIN)
 // Request that the given font be loaded by the host so it's cached by the
 // OS. Please see ChildProcessHost::PreCacheFont for details.
 IPC_SYNC_MESSAGE_CONTROL1_0(ChildProcessHostMsg_PreCacheFont,
                             LOGFONT /* font data */)
 
 // Release the cached font
 IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_ReleaseCachedFonts)
 #endif  // defined(OS_WIN)
 
 // Asks the browser to create a block of shared memory for the child process to
 // fill in and pass back to the browser.
 IPC_SYNC_MESSAGE_CONTROL1_1(ChildProcessHostMsg_SyncAllocateSharedMemory,
                             uint32 /* buffer size */,
                             base::SharedMemoryHandle)
 
 #if defined(USE_TCMALLOC)
 // Reply to ChildProcessMsg_GetTcmallocStats.
 IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_TcmallocStats,
                      std::string /* output */)
 #endif