cc: Add historgram for the number of render passes in an ubercomp delegated frame.

content/common/cc_messages.cc

 // 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.
 
 #include "content/common/cc_messages.h"
 
+#include "base/metrics/histogram.h"
 #include "cc/compositor_frame.h"
 #include "content/public/common/common_param_traits.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebData.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFilterOperations.h"
 #include "ui/gfx/transform.h"
 
 namespace IPC {
 
 void ParamTraits<WebKit::WebData>::Write(Message* m, const param_type& p) {
   if (p.isEmpty()) {
@@ skipping 572 matching lines @@
   memcpy(p->name, bytes, sizeof(p->name));
   return true;
 }
 
 void ParamTraits<cc::Mailbox>::Log(const param_type& p, std::string* l) {
   for (size_t i = 0; i < sizeof(p.name); ++i)
     *l += base::StringPrintf("%02x", p.name[i]);
 }
 
 void ParamTraits<cc::CompositorFrame>::Write(Message* m, const param_type& p) {
+  HISTOGRAM_COUNTS("Renderer4.renderPassCount", frame.renderPasses.size());

[piman, 2012/12/03 20:30:22]

I was thinking of adding this in the GLRenderer (or DirectRenderer), so that we
can get data now.

[danakj, 2012/12/03 20:31:41]

Oh, I thought that too, then I realized we get more renderpasses for aura
browser UI than we get for web pages. But I guess for the values we're concerned
about aura won't be hitting them?

   WriteParam(m, p.size);
   WriteParam(m, p.resource_list);
   WriteParam(m, p.render_pass_list.size());
   for (size_t i = 0; i < p.render_pass_list.size(); ++i)
     WriteParam(m, *p.render_pass_list[i]);
 }
 
 bool ParamTraits<cc::CompositorFrame>::Read(const Message* m,
                                             PickleIterator* iter,
                                             param_type* p) {
@@ skipping 23 matching lines @@
   l->append(", [");
   for (size_t i = 0; i < p.render_pass_list.size(); ++i) {
     if (i)
       l->append(", ");
     LogParam(*p.render_pass_list[i], l);
   }
   l->append("])");
 }
 
 }  // namespace IPC