A64: Synchronize with r16993.

ChangeLog

Index: ChangeLog
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+2013-09-27: Version 3.22.3
+
+        Added methods to enable configuration of ResourceConstraints based on
+        limits derived at runtime.
+        (Chromium issue 292928)
+
+        Added -optimize-for-size flag to optimize for memory size (will be used
+        by pre-aging CL), and removed the is_memory_constrained
+        ResourceConstraint.
+        (Chromium issue 292928)
+
+        Performance and stability improvements on all platforms.
+
+
+2013-09-26: Version 3.22.2
+
+        Performance and stability improvements on all platforms.
+
+
+2013-09-25: Version 3.22.1
+
+        Sped up creating typed arrays from array-like objects.
+        (Chromium issue 270507)
+
+        Performance and stability improvements on all platforms.
+
+
 2013-09-23: Version 3.22.0
 
         LiveEdit to mark more closure functions for re-instantiation when scope