Added rendering benchmark javascript hook

content/renderer/gpu/gpu_benchmarking_extension.cc

Index: content/renderer/gpu/gpu_benchmarking_extension.cc
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.cc b/content/renderer/gpu/gpu_benchmarking_extension.cc
index 8590e1116b855eaadbe95d5ba3ac47d569435e58..d62f6b91c9938920a9e808c8b5e4b9754773c2e6 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.cc
+++ b/content/renderer/gpu/gpu_benchmarking_extension.cc
@@ -3,14 +3,22 @@
 // found in the LICENSE file.
 
 #include "content/renderer/gpu/gpu_benchmarking_extension.h"
+
+#include <string>
+
+#include "content/public/renderer/all_rendering_benchmarks.h"
+#include "content/public/renderer/render_thread.h"
+#include "content/public/renderer/rendering_benchmark_results.h"
 #include "content/renderer/render_view_impl.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebRenderingStats.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebViewBenchmarkSupport.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "v8/include/v8.h"
 
 using WebKit::WebFrame;
+using WebKit::WebPrivatePtr;
+using WebKit::WebViewBenchmarkSupport;
 using WebKit::WebRenderingStats;
 using WebKit::WebView;
 
@@ -21,6 +29,33 @@ using WebKit::WebView;
 
 namespace content {
 
+// Benchmark results object that populates a v8 array.
+class V8BenchmarkResults : public content::RenderingBenchmarkResults {
+ public:
+  explicit V8BenchmarkResults(v8::Handle<v8::Array> results_array)
+    : results_array_(results_array) { }
+  virtual ~V8BenchmarkResults() {}
+
+  void addResult(const std::string& benchmark_name,
+                 const std::string& result_name,
+                 const std::string& time_unit,
+                 double time) {
+    v8::Handle<v8::Object> result = v8::Object::New();
+    result->Set(v8::String::New("benchmarkName", 13),
+                v8::String::New(benchmark_name.c_str(), -1));
+    result->Set(v8::String::New("resultName", 10),
+                v8::String::New(result_name.c_str(), -1));
+    result->Set(v8::String::New("timeUnit", 8),
+                v8::String::New(time_unit.c_str(), -1));
+    result->Set(v8::String::New("time", 4), v8::Number::New(time));
+    int size = results_array_->Length();
+    results_array_->Set(size, result);
+  }
+
+ private:
+  v8::Handle<v8::Array> results_array_;
+};
+
 class GpuBenchmarkingWrapper : public v8::Extension {
  public:
   GpuBenchmarkingWrapper() :
@@ -45,6 +80,10 @@ class GpuBenchmarkingWrapper : public v8::Extension {
           "  scroll_far = scroll_far || false;"
           "  native function BeginSmoothScroll();"
           "  return BeginSmoothScroll(false, scroll_far);"
+          "};"
+          "chrome.gpuBenchmarking.runRenderingBenchmarks = function(filter) {"
+          "  native function RunRenderingBenchmarks();"
+          "  return RunRenderingBenchmarks(filter);"
           "};") {}
 
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
@@ -53,7 +92,8 @@ class GpuBenchmarkingWrapper : public v8::Extension {
       return v8::FunctionTemplate::New(GetRenderingStats);
     if (name->Equals(v8::String::New("BeginSmoothScroll")))
       return v8::FunctionTemplate::New(BeginSmoothScroll);
-
+    if (name->Equals(v8::String::New("RunRenderingBenchmarks")))
+      return v8::FunctionTemplate::New(RunRenderingBenchmarks);
     return v8::Handle<v8::FunctionTemplate>();
   }
 
@@ -103,6 +143,42 @@ class GpuBenchmarkingWrapper : public v8::Extension {
     render_view_impl->BeginSmoothScroll(scroll_down, scroll_far);
     return v8::True();
   }
+
+  static v8::Handle<v8::Value> RunRenderingBenchmarks(
+        const v8::Arguments& args) {
+    // for our name filter, the argument can be undefined or null to run
+    // all benchmarks, or a string for filtering by name
+    if (!args.Length() ||
+        (!args[0]->IsString() &&
+            !(args[0]->IsNull() || args[0]->IsUndefined())))
+      return v8::Undefined();
+
+    WebFrame* web_frame = WebFrame::frameForEnteredContext();
+    if (!web_frame)
+      return v8::Undefined();
+
+    WebView* web_view = web_frame->view();
+    if (!web_view)
+      return v8::Undefined();
+
+    v8::Handle<v8::Array> resultsArray = v8::Array::New(0);
+    V8BenchmarkResults results(resultsArray);
+    std::string nameFilter;
+    if (args[0]->IsNull() || args[0]->IsUndefined()) {
+      nameFilter = "";
+    } else {
+      char filter[256];
+      args[0]->ToString()->WriteAscii(filter, 0, sizeof(filter)-1);
+      nameFilter = std::string(filter);
+    }
+    WebViewBenchmarkSupport* support =
+        web_view->benchmarkSupport();
+    content::AllRenderingBenchmarks allBenchmarks(&results, nameFilter);
+    allBenchmarks.SetUp(support);
+    allBenchmarks.Run(support);
+    allBenchmarks.TearDown(support);
+    return resultsArray;
+  }
 };
 
 v8::Extension* GpuBenchmarkingExtension::Get() {