Add paint testing mode subsequence_caching_disabled

third_party/WebKit/Source/platform/graphics/paint/PaintController.h

Index: third_party/WebKit/Source/platform/graphics/paint/PaintController.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PaintController.h b/third_party/WebKit/Source/platform/graphics/paint/PaintController.h
index 8bdfeae8142ac2694e4e9b04057e3c10cf48c655..7b0050b2a904962ece70e6cba441e086c2846108 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PaintController.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/PaintController.h
@@ -130,6 +130,9 @@ public:
     bool displayItemConstructionIsDisabled() const { return m_constructionDisabled; }
     void setDisplayItemConstructionIsDisabled(const bool disable) { m_constructionDisabled = disable; }
 
+    bool subsequenceCachingIsDisabled() const { return m_subsequenceCachingDisabled; }

[chrishtr, 2016/01/04 17:32:08]

Add a comment that these are used only benchmarking. Group with lines 130-131 to
indicate that
for those lines too.

[Xianzhu, 2016/01/04 17:39:55]

Done.

+    void setSubsequenceCachingIsDisabled(bool disable) { m_subsequenceCachingDisabled = disable; }
+
     bool textPainted() const { return m_textPainted; }
     void setTextPainted() { m_textPainted = true; }
     bool imagePainted() const { return m_imagePainted; }
@@ -181,6 +184,7 @@ protected:
         : m_newDisplayItemList(kInitialDisplayItemListCapacityBytes)
         , m_validlyCachedClientsDirty(false)
         , m_constructionDisabled(false)
+        , m_subsequenceCachingDisabled(false)
         , m_textPainted(false)
         , m_imagePainted(false)
         , m_skippingCacheCount(0)
@@ -251,6 +255,9 @@ private:
     // in performance metrics.
     bool m_constructionDisabled;
 
+    // Allow subsequence caching to be disabled to test the cost of display item caching.
+    bool m_subsequenceCachingDisabled;
+
     // Indicates this PaintController has ever had text. It is never reset to false.
     bool m_textPainted;
     bool m_imagePainted;