diff -r 000000000000 -r 6474c204b198 gfx/gl/GfxTexturesReporter.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/gl/GfxTexturesReporter.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,88 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GfxTexturesReporter.h"
+#include "GLDefs.h"
+
+using namespace mozilla;
+using namespace mozilla::gl;
+
+NS_IMPL_ISUPPORTS(GfxTexturesReporter, nsIMemoryReporter)
+
+int64_t GfxTexturesReporter::sAmount = 0;
+
+static uint32_t
+GetBitsPerTexel(GLenum format, GLenum type)
+{
+    // If there is no defined format or type, we're not taking up any memory
+    if (!format || !type) {
+        return 0;
+    }
+
+    if (format == LOCAL_GL_DEPTH_COMPONENT) {
+        if (type == LOCAL_GL_UNSIGNED_SHORT)
+            return 2*8;
+        else if (type == LOCAL_GL_UNSIGNED_INT)
+            return 4*8;
+    } else if (format == LOCAL_GL_DEPTH_STENCIL) {
+        if (type == LOCAL_GL_UNSIGNED_INT_24_8_EXT)
+            return 4*8;
+    }
+
+    if (type == LOCAL_GL_UNSIGNED_BYTE || type == LOCAL_GL_FLOAT) {
+        uint32_t multiplier = type == LOCAL_GL_FLOAT ? 32 : 8;
+        switch (format) {
+            case LOCAL_GL_ALPHA:
+            case LOCAL_GL_LUMINANCE:
+                return 1 * multiplier;
+            case LOCAL_GL_LUMINANCE_ALPHA:
+                return 2 * multiplier;
+            case LOCAL_GL_RGB:
+                return 3 * multiplier;
+            case LOCAL_GL_RGBA:
+                return 4 * multiplier;
+            case LOCAL_GL_COMPRESSED_RGB_PVRTC_2BPPV1:
+            case LOCAL_GL_COMPRESSED_RGBA_PVRTC_2BPPV1:
+                return 2;
+            case LOCAL_GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+            case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+            case LOCAL_GL_ATC_RGB:
+            case LOCAL_GL_COMPRESSED_RGB_PVRTC_4BPPV1:
+            case LOCAL_GL_COMPRESSED_RGBA_PVRTC_4BPPV1:
+            case LOCAL_GL_ETC1_RGB8_OES:
+                return 4;
+            case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+            case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+            case LOCAL_GL_ATC_RGBA_EXPLICIT_ALPHA:
+            case LOCAL_GL_ATC_RGBA_INTERPOLATED_ALPHA:
+                return 8;
+            default:
+                break;
+        }
+    } else if (type == LOCAL_GL_UNSIGNED_SHORT_4_4_4_4 ||
+               type == LOCAL_GL_UNSIGNED_SHORT_5_5_5_1 ||
+               type == LOCAL_GL_UNSIGNED_SHORT_5_6_5)
+    {
+        return 2*8;
+    }
+
+    MOZ_ASSERT(false);
+    return 0;
+}
+
+/* static */ void
+GfxTexturesReporter::UpdateAmount(MemoryUse action, GLenum format,
+                                  GLenum type, int32_t tileWidth,
+                                  int32_t tileHeight)
+{
+    int64_t bitsPerTexel = GetBitsPerTexel(format, type);
+    int64_t bytes = int64_t(tileWidth) * int64_t(tileHeight) * bitsPerTexel/8;
+    if (action == MemoryFreed) {
+        sAmount -= bytes;
+    } else {
+        sAmount += bytes;
+    }
+}