WIP: Adjust externally allocated memory when ImageBitmap is transferred

third_party/WebKit/Source/platform/graphics/UnacceleratedStaticBitmapImage.cpp

Index: third_party/WebKit/Source/platform/graphics/UnacceleratedStaticBitmapImage.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/UnacceleratedStaticBitmapImage.cpp b/third_party/WebKit/Source/platform/graphics/UnacceleratedStaticBitmapImage.cpp
index 33f21dd746d6fd8fb04bb5f3f128aea162d5c979..15afe73821c5ad8053fc9ff163cd0afd2a560e7f 100644
--- a/third_party/WebKit/Source/platform/graphics/UnacceleratedStaticBitmapImage.cpp
+++ b/third_party/WebKit/Source/platform/graphics/UnacceleratedStaticBitmapImage.cpp
@@ -5,6 +5,7 @@
 #include "platform/graphics/UnacceleratedStaticBitmapImage.h"
 
 #include "third_party/skia/include/core/SkImage.h"
+#include "v8/include/v8.h"
 
 namespace blink {
 
@@ -43,4 +44,22 @@ sk_sp<SkImage> UnacceleratedStaticBitmapImage::imageForCurrentFrame() {
   return m_image;
 }
 
+void UnacceleratedStaticBitmapImage::
+    registerExternalAllocationWithCurrentContext() {
+  if (!m_image)
+    return;
+  int externallyAllocatedMemory = m_image->width() * m_image->height() * 4;

[jbroman, 2017/04/04 15:44:56]

probably not your problem, but beware overflow in this calculation

+  v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(
+      static_cast<int64_t>(externallyAllocatedMemory));
+}
+
+void UnacceleratedStaticBitmapImage::
+    unregisterExternalAllocationWithCurrentContext() {
+  if (!m_image)
+    return;
+  int externallyAllocatedMemory = m_image->width() * m_image->height() * 4;
+  v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(
+      -static_cast<int64_t>(externallyAllocatedMemory));
+}
+
 }  // namespace blink