WIP: Introduce CompressibleString

third_party/WebKit/Source/core/page/Page.cpp

Index: third_party/WebKit/Source/core/page/Page.cpp
diff --git a/third_party/WebKit/Source/core/page/Page.cpp b/third_party/WebKit/Source/core/page/Page.cpp
index a282c4cd654a998ee7201054f1e7b3031e22c9e3..83f657b3f9e804602490581d37215e72fecce833 100644
--- a/third_party/WebKit/Source/core/page/Page.cpp
+++ b/third_party/WebKit/Source/core/page/Page.cpp
@@ -51,6 +51,7 @@
 #include "core/paint/PaintLayer.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/plugins/PluginData.h"
+#include "platform/text/CompressibleString.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
@@ -540,13 +541,15 @@ void Page::acceptLanguagesChanged()
 void Page::purgeMemory(MemoryPurgeMode mode, DeviceKind deviceKind)
 {
     Frame* frame = mainFrame();
-    if (deviceKind != DeviceKind::LowEnd || !frame || !frame->isLocalFrame())
-        return;
-    if (mode == MemoryPurgeMode::InactiveTab) {
-        if (Document* document = toLocalFrame(frame)->document())
-            document->fetcher()->garbageCollectDocumentResources();
-        memoryCache()->pruneAll();
+    if (deviceKind == DeviceKind::LowEnd && frame && frame->isLocalFrame()) {
+        if (mode == MemoryPurgeMode::InactiveTab) {
+            if (Document* document = toLocalFrame(frame)->document())
+                document->fetcher()->garbageCollectDocumentResources();
+            memoryCache()->pruneAll();
+        }
     }
+
+    CompressibleStringImpl::purgeMemory();

[haraken, 2015/11/26 11:50:03]

I'd propose to introduce a separate method for doing the string compression
(e.g., window.compressStrings) to measure the memory impact. If you use
MemoryPurgeController::purgeMemory for the measurement, it will do a bunch of
other reductions at the same time (e.g., memoryCache()->pruneAll()), which will
confuse your measurement.

 }
 
 DEFINE_TRACE(Page)