Prepare push to trunk. Now working on version 3.15.13.

R=svenpanne@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/11665006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13261 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

+2012-12-21: Version 3.15.12
+
+        V8_Fatal now prints C++ stack trace in debug mode.
+
+        Added HTML-based tick processor.
+
+        Continued implementation of Object.observe (V8 issue 2409).
+
+        Fixed V8 issues 2243, 2340, 2393, 2399, 2457.
+
+        Fixed Chromium issues 125308, 165637, 166379, 166553.
+
+        Performance and stability improvements on all platforms.
+
+
 2012-12-10: Version 3.15.11
 
         Define CAN_USE_VFP2/3_INSTRUCTIONS based on arm_neon and arm_fpu GYP

src/version.cc

@@ -34,7 +34,7 @@
 // cannot be changed without changing the SCons build script.
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     15
-#define BUILD_NUMBER      12
+#define BUILD_NUMBER      13
 #define PATCH_LEVEL       0
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)