Fix small bugs with pulling ftrace files

1) Support tabbing in explorer.html
2) Add a .gtiignore for private ftrace file sets.
3) Pull whole tracing/ file rather than events/

Change-Id: Ie49ed926662a21f00bb913bf807d7133baf57cfa

tools/pull_ftrace_format_files.py

diff --git a/tools/pull_ftrace_format_files.py b/tools/pull_ftrace_format_files.py
index 81ff13e..de5d3a7 100755
--- a/tools/pull_ftrace_format_files.py
+++ b/tools/pull_ftrace_format_files.py
@@ -88,14 +88,15 @@
 def pull_format_files(serial, output_directory):
   # Pulling each file individually is 100x slower so we pipe all together then
   # split them on the host.
-  cmd = "find /sys/kernel/debug/tracing/events/ " \
+  cmd = "find /sys/kernel/debug/tracing/ " \
+      "-name available_events -o " \
       "-name format -o " \
       "-name header_event -o " \
       "-name header_page | " \
       "while read f; do echo 'path:' $f; cat $f; done"
 
   output = adb('shell', cmd, serial=serial)
-  sections = output.split('path: /sys/kernel/debug/tracing/events/')
+  sections = output.split('path: /sys/kernel/debug/tracing/')
   for section in sections:
     if not section:
       continue