Bug 1247405 - Track peak texture memory usage r=nical

gfx/gl/GfxTexturesReporter.cpp

@@ -16,6 +16,7 @@ using namespace mozilla::gl;
 NS_IMPL_ISUPPORTS(GfxTexturesReporter, nsIMemoryReporter)
 
 Atomic<size_t> GfxTexturesReporter::sAmount(0);
+Atomic<size_t> GfxTexturesReporter::sPeakAmount(0);
 Atomic<size_t> GfxTexturesReporter::sTileWasteAmount(0);
 
 /* static */ void
@@ -26,6 +27,9 @@ GfxTexturesReporter::UpdateAmount(MemoryUse action, size_t amount)
         sAmount -= amount;
     } else {
         sAmount += amount;
+        if (sAmount > sPeakAmount) {
+            sPeakAmount = sAmount;
+        }
     }
 
 #ifdef MOZ_CRASHREPORTER

gfx/gl/GfxTexturesReporter.h

@@ -53,13 +53,18 @@ public:
         MOZ_COLLECT_REPORT("gfx-tiles-waste", KIND_OTHER, UNITS_BYTES,
             int64_t(sTileWasteAmount),
             "Memory lost due to tiles extending past content boundaries");
-        return MOZ_COLLECT_REPORT(
+        MOZ_COLLECT_REPORT(
             "gfx-textures", KIND_OTHER, UNITS_BYTES, int64_t(sAmount),
             "Memory used for storing GL textures.");
+        MOZ_COLLECT_REPORT(
+            "gfx-textures-peak", KIND_OTHER, UNITS_BYTES, int64_t(sPeakAmount),
+            "Peak memory used for storing GL textures.");
+        return NS_OK;
     }
 
 private:
     static Atomic<size_t> sAmount;
+    static Atomic<size_t> sPeakAmount;
     // Count the amount of memory lost to tile waste
     static Atomic<size_t> sTileWasteAmount;
 };