[Oilpan] Unify memory usage reporters of Oilpan

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 63d691d071e28e0340a84d5aae3a19f0c0839ca3..ab9ea846a1fc6e2522bdd89172e0f8a9246f2bd2 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -129,7 +129,6 @@ inline HTMLCanvasElement::HTMLCanvasElement(Document& document)
     , DocumentVisibilityObserver(document)
     , m_size(DefaultWidth, DefaultHeight)
     , m_ignoreReset(false)
-    , m_externallyAllocatedMemory(0)
     , m_originClean(true)
     , m_didFailToCreateImageBuffer(false)
     , m_imageBufferIsClear(false)
@@ -142,7 +141,6 @@ DEFINE_NODE_FACTORY(HTMLCanvasElement)
 
 HTMLCanvasElement::~HTMLCanvasElement()
 {
-    v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-m_externallyAllocatedMemory);
 #if !ENABLE(OILPAN)
     // Ensure these go away before the ImageBuffer.
     m_context.clear();
@@ -265,7 +263,6 @@ CanvasRenderingContext* HTMLCanvasElement::getCanvasRenderingContext(const Strin
         const ComputedStyle* style = ensureComputedStyle();
         if (style)
             m_context->setFilterQuality(style->imageRendering() == ImageRenderingPixelated ? kNone_SkFilterQuality : kLow_SkFilterQuality);
-        updateExternallyAllocatedMemory();
     }
     setNeedsCompositingUpdate();
 
@@ -784,8 +781,6 @@ void HTMLCanvasElement::createImageBufferInternal(PassOwnPtr<ImageBufferSurface>
 
     m_didFailToCreateImageBuffer = false;
 
-    updateExternallyAllocatedMemory();
-
     if (is3D()) {
         // Early out for WebGL canvases
         return;
@@ -816,38 +811,6 @@ DEFINE_TRACE(HTMLCanvasElement)
     HTMLElement::trace(visitor);
 }
 
-void HTMLCanvasElement::updateExternallyAllocatedMemory() const
-{
-    int bufferCount = 0;
-    if (m_imageBuffer) {
-        bufferCount++;
-        if (m_imageBuffer->isAccelerated()) {
-            // The number of internal GPU buffers vary between one (stable
-            // non-displayed state) and three (triple-buffered animations).
-            // Adding 2 is a pessimistic but relevant estimate.
-            // Note: These buffers might be allocated in GPU memory.
-            bufferCount += 2;
-        }
-    }
-    if (m_copiedImage)
-        bufferCount++;
-
-    // Four bytes per pixel per buffer.
-    Checked<intptr_t, RecordOverflow> checkedExternallyAllocatedMemory = 4 * bufferCount;
-    if (is3D())
-        checkedExternallyAllocatedMemory += m_context->externallyAllocatedBytesPerPixel();
-
-    checkedExternallyAllocatedMemory *= width();
-    checkedExternallyAllocatedMemory *= height();
-    intptr_t externallyAllocatedMemory;
-    if (checkedExternallyAllocatedMemory.safeGet(externallyAllocatedMemory) == CheckedState::DidOverflow)
-        externallyAllocatedMemory = std::numeric_limits<intptr_t>::max();
-
-    // Subtracting two intptr_t that are known to be positive will never underflow.
-    v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(externallyAllocatedMemory - m_externallyAllocatedMemory);
-    m_externallyAllocatedMemory = externallyAllocatedMemory;
-}
-
 SkCanvas* HTMLCanvasElement::drawingCanvas() const
 {
     return buffer() ? m_imageBuffer->canvas() : nullptr;
@@ -907,7 +870,6 @@ PassRefPtr<Image> HTMLCanvasElement::copiedImage(SourceDrawingBuffer sourceBuffe
         needToUpdate |= m_context->paintRenderingResultsToCanvas(sourceBuffer);
     if (needToUpdate && buffer()) {
         m_copiedImage = buffer()->newImageSnapshot(hint);
-        updateExternallyAllocatedMemory();
     }
     return m_copiedImage;
 }
@@ -916,14 +878,12 @@ void HTMLCanvasElement::discardImageBuffer()
 {
     m_imageBuffer.clear();
     m_dirtyRect = FloatRect();
-    updateExternallyAllocatedMemory();
 }
 
 void HTMLCanvasElement::clearCopiedImage()
 {
     if (m_copiedImage) {
         m_copiedImage.clear();
-        updateExternallyAllocatedMemory();
     }
 }