publish canvas context API stat metrics

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
index bf12c2feaf31ba82571f7577f0a1568762032aff..120c1a581abc2a0511df40b7ad4c9afac80c1fcd 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -48,6 +48,7 @@
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/Canvas2DImageBufferSurface.h"
+#include "platform/graphics/CanvasMetrics.h"
 #include "platform/graphics/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/RecordingImageBufferSurface.h"
@@ -117,6 +118,7 @@ inline HTMLCanvasElement::HTMLCanvasElement(Document& document)
     , m_imageBufferIsClear(false)
 {
     setHasCustomStyleCallbacks();
+    CanvasMetrics::countCanvasContextStat(CanvasMetrics::ContextCreated);

[Justin Novosad, 2015/11/19 20:36:08]

ContextCreated -> CanvasCreated

[zmin, 2015/11/19 22:23:36]

Done.

 }
 
 DEFINE_NODE_FACTORY(HTMLCanvasElement)
@@ -653,20 +655,29 @@ PassOwnPtr<ImageBufferSurface> HTMLCanvasElement::createImageBufferSurface(const
         if (document().settings())
             *msaaSampleCount = document().settings()->accelerated2dCanvasMSAASampleCount();
         OwnPtr<ImageBufferSurface> surface = adoptPtr(new Canvas2DImageBufferSurface(deviceSize, *msaaSampleCount, opacityMode, Canvas2DLayerBridge::EnableAcceleration));
-        if (surface->isValid())
+        if (surface->isValid()) {
+            CanvasMetrics::countCanvasContextStat(CanvasMetrics::ContextCreatedWithGPUAccelerated);

[Justin Novosad, 2015/11/19 20:36:08]

GPUAccelerated2DCanvasImageBufferCreated

[zmin, 2015/11/19 22:23:36]

Done.

             return surface.release();
+        }
+        CanvasMetrics::countCanvasContextStat(CanvasMetrics::GPUContextCreationFailed);

[Justin Novosad, 2015/11/19 20:36:08]

GPUAccelerated2DCanvasImageBufferCreationFailed

[zmin, 2015/11/19 22:23:36]

Done.

     }
 
     OwnPtr<RecordingImageBufferFallbackSurfaceFactory> surfaceFactory = adoptPtr(new UnacceleratedSurfaceFactory());
 
     if (shouldUseDisplayList(deviceSize)) {
         OwnPtr<ImageBufferSurface> surface = adoptPtr(new RecordingImageBufferSurface(deviceSize, surfaceFactory.release(), opacityMode));
-        if (surface->isValid())
+        if (surface->isValid()) {
+            CanvasMetrics::countCanvasContextStat(CanvasMetrics::ContextCreatedWithDisplayList);

[Justin Novosad, 2015/11/19 20:36:08]

DisplayList2DCanvasImageBufferCreated

[zmin, 2015/11/19 22:23:36]

Done.

             return surface.release();
+        }
         surfaceFactory = adoptPtr(new UnacceleratedSurfaceFactory()); // recreate because previous one was released
     }
-
-    return surfaceFactory->createSurface(deviceSize, opacityMode);
+    CanvasMetrics::countCanvasContextStat(CanvasMetrics::ContextCreatedWithSoftware);

[Justin Novosad, 2015/11/19 20:36:08]

Too early to count this, we don't know if it will succeed yet. Should be
Unaccelerated2DCanvasImageBufferCreated

[zmin, 2015/11/19 22:23:36]

Done. Also change this to
if (!surface->isValid()) {
   CanvasMetrics....Failed);
} else {
   CanvasMetrics...Created);
}

+    auto surface = surfaceFactory->createSurface(deviceSize, opacityMode);
+    if (!surface->isValid()) {
+        CanvasMetrics::countCanvasContextStat(CanvasMetrics::SoftwareContextCreationFailed);

[Justin Novosad, 2015/11/19 20:36:08]

Unaccelerated2DCanvasImageBufferCreationFailed

[zmin, 2015/11/19 22:23:36]

Done.

+    }
+    return surface;
 }
 
 void HTMLCanvasElement::createImageBuffer()