Add an IPC method for Blink to call RapporService::RecordSample()

content/public/test/mock_render_thread.cc

Index: content/public/test/mock_render_thread.cc
diff --git a/content/public/test/mock_render_thread.cc b/content/public/test/mock_render_thread.cc
index 34cabd753dd753bcd121efd895960cffd2a70cff..98243adc9b260747066287fb44117df0af8ed58e 100644
--- a/content/public/test/mock_render_thread.cc
+++ b/content/public/test/mock_render_thread.cc
@@ -134,6 +134,11 @@ void MockRenderThread::RecordAction(const base::UserMetricsAction& action) {
 void MockRenderThread::RecordComputedAction(const std::string& action) {
 }
 
+void MockRenderThread::RecordRappor(
+    const std::string& metric,
+    const std::string& sample) {
+}
+
 scoped_ptr<base::SharedMemory>
     MockRenderThread::HostAllocateSharedMemoryBuffer(
         size_t buffer_size) {