Add UMA histogram to determine how often Stage3D could be used.

webkit/plugins/ppapi/ppapi_plugin_instance.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 "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 11 matching lines @@
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/c/ppb_core.h"
 #include "ppapi/c/ppb_gamepad.h"
 #include "ppapi/c/ppp_input_event.h"
 #include "ppapi/c/ppp_instance.h"
 #include "ppapi/c/ppp_messaging.h"
 #include "ppapi/c/ppp_mouse_lock.h"
 #include "ppapi/c/private/pp_content_decryptor.h"
 #include "ppapi/c/private/ppp_instance_private.h"
+#include "ppapi/shared_impl/ppapi_preferences.h"
 #include "ppapi/shared_impl/ppb_input_event_shared.h"
 #include "ppapi/shared_impl/ppb_url_util_shared.h"
 #include "ppapi/shared_impl/ppb_view_shared.h"
 #include "ppapi/shared_impl/ppp_instance_combined.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/shared_impl/scoped_pp_resource.h"
 #include "ppapi/shared_impl/time_conversion.h"
 #include "ppapi/shared_impl/var.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_buffer_api.h"
@@ skipping 47 matching lines @@
 #endif  // defined(OS_MACOSX)
 
 #if defined(USE_SKIA)
 #include "printing/metafile.h"
 #include "printing/metafile_skia_wrapper.h"
 #include "skia/ext/platform_device.h"
 #endif
 
 #if defined(OS_WIN)
 #include "base/metrics/histogram.h"
+#include "base/win/windows_version.h"
 #include "skia/ext/platform_canvas.h"
 #include "ui/gfx/codec/jpeg_codec.h"
 #include "ui/gfx/gdi_util.h"
 #endif
 
 using base::StringPrintf;
 using ppapi::InputEventData;
 using ppapi::PpapiGlobals;
 using ppapi::PPB_InputEvent_Shared;
 using ppapi::PPB_View_Shared;
@@ skipping 417 matching lines @@
   // Free any associated graphics.
   SetFullscreen(false);
   FlashSetFullscreen(false, false);
   // Unbind current 2D or 3D graphics context.
   BindGraphics(pp_instance(), 0);
   InvalidateRect(gfx::Rect());
 
   delegate()->PluginCrashed(this);
 }
 
+static void SetGPUHistogram(const ::ppapi::Preferences& prefs,
+                            const std::vector<std::string>& arg_names,
+                            const std::vector<std::string>& arg_values) {
+  // Calculate a histogram to let us determine how likely people are to try to
+  // run Stage3D content on machines that have it blacklisted. This only tests
+  // on XP at the moment.
+#if defined(OS_WIN)
+  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+    bool needs_gpu = false;
+
+    for (size_t i = 0; i < arg_names.size(); i++) {
+      if (arg_names[i] == "wmode") {
+        // In theory content other than Flash could have a "wmode" argument,
+        // but that's pretty unlikely.
+        if (arg_values[i] == "direct" || arg_values[i] == "gpu")
+          needs_gpu = true;
+        break;
+      }
+    }
+    // The value of this histogram is 1 or 3 if 3D is not blacklisted on this
+    // card, and 2 or 3 if the content needs the GPU.

[vangelis, 2012/08/28 17:30:23]

Maybe it would be more clear to enumerate the potential results:
0 : No 3D content and GPU is blacklisted
1 : No 3D content and GPU is not blacklisted
2 : 3D content but GPU is blacklisted
3 : 3D content and GPU is not blacklisted

Also, since you're in here, should we do this for other versions of windows?  It
would be useful to know where we stand there too.

+    UMA_HISTOGRAM_ENUMERATION("Flash.UsesGPU",
+        needs_gpu * 2 + prefs.is_webgl_supported, 4);
+  }
+#endif
+}
+
 bool PluginInstance::Initialize(WebPluginContainer* container,
                                 const std::vector<std::string>& arg_names,
                                 const std::vector<std::string>& arg_values,
                                 const GURL& plugin_url,
                                 bool full_frame) {
   container_ = container;
   plugin_url_ = plugin_url;
   full_frame_ = full_frame;
 
   container_->setIsAcceptingTouchEvents(IsAcceptingTouchEvents());
 
+  SetGPUHistogram(delegate_->GetPreferences(), arg_names, arg_values);
+
   argn_ = arg_names;
   argv_ = arg_values;
   scoped_array<const char*> argn_array(StringVectorToArgArray(argn_));
   scoped_array<const char*> argv_array(StringVectorToArgArray(argv_));
   return PP_ToBool(instance_interface_->DidCreate(pp_instance(),
                                                   argn_.size(),
                                                   argn_array.get(),
                                                   argv_array.get()));
 }
 
@@ skipping 1876 matching lines @@
   screen_size_for_fullscreen_ = gfx::Size();
   WebElement element = container_->element();
   element.setAttribute(WebString::fromUTF8(kWidth), width_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kHeight), height_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kBorder), border_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kStyle), style_before_fullscreen_);
 }
 
 }  // namespace ppapi
 }  // namespace webkit