Throttle rendering pipeline for invisible frames

third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp

Index: third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp b/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
index efc1b4b99a161bf0e73e1faf24b2430f7a210383..7278c05cdf31212a1cba10696ecc13231c89eea8 100644
--- a/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
@@ -65,6 +65,7 @@ DocumentLifecycle::DeprecatedTransition::~DeprecatedTransition()
 DocumentLifecycle::DocumentLifecycle()
     : m_state(Uninitialized)
     , m_detachCount(0)
+    , m_throttlingMode(ThrottlingMode::Disallow)
 {
 }
 
@@ -291,6 +292,16 @@ void DocumentLifecycle::ensureStateAtMost(State state)
     m_state = state;
 }
 
+void DocumentLifecycle::setThrottlingMode(ThrottlingMode throttlingMode)
+{
+    m_throttlingMode = throttlingMode;
+}
+
+DocumentLifecycle::ThrottlingMode DocumentLifecycle::throttlingMode() const
+{
+    return m_throttlingMode;
+}
+
 #if ENABLE(ASSERT)
 #define DEBUG_STRING_CASE(StateName) \
     case StateName: return #StateName