Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

chrome/renderer/pepper/pepper_uma_host.cc

 // Copyright 2014 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 "chrome/renderer/pepper/pepper_uma_host.h"
 
 #include "base/metrics/histogram.h"
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 39 matching lines @@
     allowed_origins_.insert(kPredefinedAllowedUMAOrigins[i]);
   for (size_t i = 0; i < arraysize(kWhitelistedHistogramPrefixes); ++i)
     allowed_histogram_prefixes_.insert(kWhitelistedHistogramPrefixes[i]);
 }
 
 PepperUMAHost::~PepperUMAHost() {}
 
 int32_t PepperUMAHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
-  IPC_BEGIN_MESSAGE_MAP(PepperUMAHost, msg)
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_UMA_HistogramCustomTimes,
-                                    OnHistogramCustomTimes);
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_UMA_HistogramCustomCounts,
-                                    OnHistogramCustomCounts);
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_UMA_HistogramEnumeration,
-                                    OnHistogramEnumeration);
-  PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_UMA_IsCrashReportingEnabled,
-                                      OnIsCrashReportingEnabled);
-  IPC_END_MESSAGE_MAP()
+  PPAPI_BEGIN_MESSAGE_MAP(PepperUMAHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_UMA_HistogramCustomTimes,
+                                      OnHistogramCustomTimes)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_UMA_HistogramCustomCounts,
+                                      OnHistogramCustomCounts)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_UMA_HistogramEnumeration,
+                                      OnHistogramEnumeration)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
+        PpapiHostMsg_UMA_IsCrashReportingEnabled, OnIsCrashReportingEnabled)
+  PPAPI_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
 
 bool PepperUMAHost::IsPluginWhitelisted() {
   return ChromeContentRendererClient::IsExtensionOrSharedModuleWhitelisted(
       document_url_, allowed_origins_);
 }
 
 bool PepperUMAHost::IsHistogramAllowed(const std::string& histogram) {
   if (is_plugin_in_process_ && histogram.find("NaCl.") == 0) {
@@ skipping 93 matching lines @@
     ppapi::host::HostMessageContext* context) {
   if (!IsPluginWhitelisted())
     return PP_ERROR_NOACCESS;
   bool enabled = false;
   content::RenderThread::Get()->Send(
       new ChromeViewHostMsg_IsCrashReportingEnabled(&enabled));
   if (enabled)
     return PP_OK;
   return PP_ERROR_FAILED;
 }