Add support for running the profiler output processing scripts with node.

tools/linux-tick-processor

Index: tools/linux-tick-processor
diff --git a/tools/linux-tick-processor b/tools/linux-tick-processor
index 7864fb405780569f136732f642b42c34d5e43bba..5695e79fe76e9143817f5510798cc2a3950c4425 100755
--- a/tools/linux-tick-processor
+++ b/tools/linux-tick-processor
@@ -27,15 +27,19 @@ if [ ! -x "$d8_exec" ]; then
 fi
 
 if [ ! -x "$d8_exec" ]; then
-  echo "d8 shell not found in $D8_PATH"
-  echo "To build, execute 'make native' from the V8 directory"
-  exit 1
+  if [! -x "node"]; then
+    echo "d8 shell not found in $D8_PATH"
+    echo "To build, execute 'make native' from the V8 directory"
+    exit 1
+  else
+    node $tools_path/tickprocessor-driver.js $@
+  fi
+else
+  # nm spits out 'no symbols found' messages to stderr.
+  cat $log_file | $d8_exec $tools_path/splaytree.js $tools_path/codemap.js \
+    $tools_path/csvparser.js $tools_path/consarray.js \
+    $tools_path/profile.js $tools_path/profile_view.js \
+    $tools_path/logreader.js $tools_path/tickprocessor.js \
+    $tools_path/SourceMap.js \
+    $tools_path/tickprocessor-driver.js -- $@ 2>/dev/null
 fi
-
-# nm spits out 'no symbols found' messages to stderr.
-cat $log_file | $d8_exec $tools_path/splaytree.js $tools_path/codemap.js \
-  $tools_path/csvparser.js $tools_path/consarray.js \
-  $tools_path/profile.js $tools_path/profile_view.js \
-  $tools_path/logreader.js $tools_path/tickprocessor.js \
-  $tools_path/SourceMap.js \
-  $tools_path/tickprocessor-driver.js -- $@ 2>/dev/null