Expose a gpu-benchmark-only printToSkPicture API to JS. This function records...

Expose a gpu-benchmark-only printToSkPicture API to JS. This function records the page to an SkPicture, and dumps the resulting picture to a local file.
BUG=130422

Review URL: https://chromiumcodereview.appspot.com/10787025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149287 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/gpu/gpu_benchmarking_extension.cc

@@ -6,28 +6,68 @@
 
 #include <string>
 
+#include "base/file_path.h"
+#include "base/file_util.h"
 #include "base/memory/scoped_vector.h"
+#include "base/string_number_conversions.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/renderer/all_rendering_benchmarks.h"
+#include "content/renderer/render_view_impl.h"
 #include "content/renderer/rendering_benchmark.h"
 #include "content/renderer/rendering_benchmark_results.h"
-#include "content/renderer/render_view_impl.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkStream.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/WebViewBenchmarkSupport.h"
 #include "v8/include/v8.h"
 
+using WebKit::WebCanvas;
 using WebKit::WebFrame;
 using WebKit::WebPrivatePtr;
-using WebKit::WebViewBenchmarkSupport;
 using WebKit::WebRenderingStats;
+using WebKit::WebSize;
 using WebKit::WebView;
+using WebKit::WebViewBenchmarkSupport;
 
 const char kGpuBenchmarkingExtensionName[] = "v8/GpuBenchmarking";
 
-using WebKit::WebFrame;
-using WebKit::WebView;
+namespace {
+
+class SkPictureRecorder : public WebViewBenchmarkSupport::PaintClient {
+ public:
+  explicit SkPictureRecorder(const FilePath& dirpath)
+      : dirpath_(dirpath),
+        layer_id_(0) {
+  }
+
+  virtual WebCanvas* willPaint(const WebSize& size) {
+    return picture_.beginRecording(size.width, size.height);
+  }
+
+  virtual void didPaint(WebCanvas* canvas) {
+    DCHECK(canvas == picture_.getRecordingCanvas());
+    picture_.endRecording();
+    // Serialize picture to file.
+    // TODO(alokp): Note that for this to work Chrome needs to be launched with
+    // --no-sandbox command-line flag. Get rid of this limitation.
+    // CRBUG: 139640.
+    std::string filename = "layer_" + base::IntToString(layer_id_++) + ".skp";
+    std::string filepath = dirpath_.AppendASCII(filename).MaybeAsASCII();
+    DCHECK(!filepath.empty());
+    SkFILEWStream file(filepath.c_str());
+    DCHECK(file.isValid());
+    picture_.serialize(&file);
+  }
+
+ private:
+  FilePath dirpath_;
+  int layer_id_;
+  SkPicture picture_;
+};
+
+}  // namespace
 
 namespace content {
 
@@ -76,6 +116,10 @@ class GpuBenchmarkingWrapper : public v8::Extension {
           "  native function GetRenderingStats();"
           "  return GetRenderingStats();"
           "};"
+          "chrome.gpuBenchmarking.printToSkPicture = function(dirname) {"
+          "  native function PrintToSkPicture();"
+          "  return PrintToSkPicture(dirname);"
+          "};"
           "chrome.gpuBenchmarking.beginSmoothScrollDown = "
           "    function(scroll_far) {"
           "  scroll_far = scroll_far || false;"
@@ -96,6 +140,8 @@ class GpuBenchmarkingWrapper : public v8::Extension {
       v8::Handle<v8::String> name) {
     if (name->Equals(v8::String::New("GetRenderingStats")))
       return v8::FunctionTemplate::New(GetRenderingStats);
+    if (name->Equals(v8::String::New("PrintToSkPicture")))
+      return v8::FunctionTemplate::New(PrintToSkPicture);
     if (name->Equals(v8::String::New("BeginSmoothScroll")))
       return v8::FunctionTemplate::New(BeginSmoothScroll);
     if (name->Equals(v8::String::New("RunRenderingBenchmarks")))
@@ -140,6 +186,42 @@ class GpuBenchmarkingWrapper : public v8::Extension {
     return stats_object;
   }
 
+  static v8::Handle<v8::Value> PrintToSkPicture(const v8::Arguments& args) {
+    if (args.Length() != 1)
+      return v8::Undefined();
+
+    v8::String::AsciiValue dirname(args[0]);
+    if (dirname.length() == 0)
+      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();
+
+    WebViewBenchmarkSupport* benchmark_support = web_view->benchmarkSupport();
+    if (!benchmark_support)
+      return v8::Undefined();
+
+    FilePath dirpath;
+    dirpath = dirpath.AppendASCII(*dirname);
+    if (!file_util::CreateDirectory(dirpath) ||
+        !file_util::PathIsWritable(dirpath)) {
+      std::string msg("Path is not writable: ");
+      msg.append(dirpath.MaybeAsASCII());
+      return v8::ThrowException(v8::Exception::Error(
+          v8::String::New(msg.c_str(), msg.length())));
+    }
+
+    SkPictureRecorder recorder(dirpath);
+    benchmark_support->paint(&recorder,
+                             WebViewBenchmarkSupport::PaintModeEverything);
+    return v8::Undefined();
+  }
+
   static v8::Handle<v8::Value> BeginSmoothScroll(const v8::Arguments& args) {
     WebFrame* web_frame = WebFrame::frameForEnteredContext();
     if (!web_frame)