diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/images/SkImageRef_GlobalPool.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/src/images/SkImageRef_GlobalPool.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,100 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkImageRef_GlobalPool.h"
+#include "SkImageRefPool.h"
+#include "SkThread.h"
+
+SK_DECLARE_STATIC_MUTEX(gGlobalPoolMutex);
+
+/*
+ *  This returns the lazily-allocated global pool. It must be called
+ *  from inside the guard mutex, so we safely only ever allocate 1.
+ */
+static SkImageRefPool* GetGlobalPool() {
+    static SkImageRefPool* gPool;
+    if (NULL == gPool) {
+        gPool = SkNEW(SkImageRefPool);
+        // call sk_atexit(...) when we have that, to free the global pool
+    }
+    return gPool;
+}
+
+SkImageRef_GlobalPool::SkImageRef_GlobalPool(const SkImageInfo& info,
+                                             SkStreamRewindable* stream,
+                                             int sampleSize)
+        : SkImageRef(info, stream, sampleSize, &gGlobalPoolMutex) {
+    SkASSERT(&gGlobalPoolMutex == this->mutex());
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    GetGlobalPool()->addToHead(this);
+}
+
+SkImageRef_GlobalPool::~SkImageRef_GlobalPool() {
+    SkASSERT(&gGlobalPoolMutex == this->mutex());
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    GetGlobalPool()->detach(this);
+}
+
+/*  By design, onUnlockPixels() already is inside the mutex-lock,
+ *  and it is the (indirect) caller of onDecode(), therefore we can assume
+ *  that we also are already inside the mutex. Hence, we can reference
+ *  the global-pool directly.
+ */
+bool SkImageRef_GlobalPool::onDecode(SkImageDecoder* codec, SkStreamRewindable* stream,
+                                     SkBitmap* bitmap, SkBitmap::Config config,
+                                     SkImageDecoder::Mode mode) {
+    if (!this->INHERITED::onDecode(codec, stream, bitmap, config, mode)) {
+        return false;
+    }
+    if (mode == SkImageDecoder::kDecodePixels_Mode) {
+        // no need to grab the mutex here, it has already been acquired.
+        GetGlobalPool()->justAddedPixels(this);
+    }
+    return true;
+}
+
+void SkImageRef_GlobalPool::onUnlockPixels() {
+    this->INHERITED::onUnlockPixels();
+
+    // by design, onUnlockPixels() already is inside the mutex-lock
+    GetGlobalPool()->canLosePixels(this);
+}
+
+SkImageRef_GlobalPool::SkImageRef_GlobalPool(SkReadBuffer& buffer)
+        : INHERITED(buffer, &gGlobalPoolMutex) {
+    SkASSERT(&gGlobalPoolMutex == this->mutex());
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    GetGlobalPool()->addToHead(this);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// global imagerefpool wrappers
+
+size_t SkImageRef_GlobalPool::GetRAMBudget() {
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    return GetGlobalPool()->getRAMBudget();
+}
+
+void SkImageRef_GlobalPool::SetRAMBudget(size_t size) {
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    GetGlobalPool()->setRAMBudget(size);
+}
+
+size_t SkImageRef_GlobalPool::GetRAMUsed() {
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    return GetGlobalPool()->getRAMUsed();
+}
+
+void SkImageRef_GlobalPool::SetRAMUsed(size_t usage) {
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    GetGlobalPool()->setRAMUsed(usage);
+}
+
+void SkImageRef_GlobalPool::DumpPool() {
+    SkAutoMutexAcquire ac(gGlobalPoolMutex);
+    GetGlobalPool()->dump();
+}