Import SQLite 3.10.2.

third_party/sqlite/src/tool/vdbe_profile.tcl

Index: third_party/sqlite/src/tool/vdbe_profile.tcl
diff --git a/third_party/sqlite/src/tool/vdbe_profile.tcl b/third_party/sqlite/src/tool/vdbe_profile.tcl
index fb1f955391ae2782147796fe9848a3c156bb184d..a0dc99ec33a95de9074e42c51b4297074322db89 100644
--- a/third_party/sqlite/src/tool/vdbe_profile.tcl
+++ b/third_party/sqlite/src/tool/vdbe_profile.tcl
@@ -1,8 +1,16 @@
 #!/bin/tclsh
 #
+# SUMMARY:
 # Run this script in the same directory as the "vdbe_profile.out" file.
 # This script summarizes the results contained in that file.
 #
+# DETAILS:
+# Compile SQLite using the -DVDBE_PROFILE option on Linux.  This causes 
+# performance information about individual VDBE operations to be appended
+# to the "vdbe_profile.out" file.  After content has been accumulated in
+# vdbe_profile.out, run this script to analyze the output and generate a
+# report.
+#
 if {![file readable vdbe_profile.out]} {
   error "run this script in the same directory as the vdbe_profile.out file"
 }