Add proxy for syscall time

This CL adds a proxy, FXSYS_time, for the time syscall, so that a
testing mechanism can be implemented. Specically there is now a flag
for pdfium_test, --time=, that allows setting the time since the epoch
that will be returned. This plumbed all the way down into the proxy
and allows for stable results for tests that depend on getting the
current time.

There are other places in the code base that will need to be patched
like this, that will be dealt with in follow on CLs.

BUG=pdfium:1104

Change-Id: I2de185f8d47abe46704dd579c13a54948b7f81e0
Reviewed-on: https://pdfium-review.googlesource.com/39750
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

3 files changed, 18 insertions, 4 deletions

diff --git a/testing/tools/api_check.py b/testing/tools/api_check.py
index 2c5cc4fa3e..934577b21b 100755
--- a/testing/tools/api_check.py
+++ b/testing/tools/api_check.py
@@ -22,6 +22,8 @@ def _IsValidFunctionName(function, filename):
     return True
   if function == 'FSDK_SetUnSpObjProcessHandler' and filename == 'fpdf_ext.h':
     return True
+  if function == 'FSDK_SetTimeFunction' and filename == 'fpdf_ext.h':
+    return True
   if function.startswith('FORM_') and filename == 'fpdf_formfill.h':
     return True
   return False
diff --git a/testing/tools/make_expected.sh b/testing/tools/make_expected.sh
index a70df797c2..9b7e3d8716 100755
--- a/testing/tools/make_expected.sh
+++ b/testing/tools/make_expected.sh
@@ -6,6 +6,11 @@
 #
 # Script to generate expected result files.
 
+# Arbitrary timestamp, expressed in seconds since the epoch, used to make sure
+# that tests that depend on the current time are stable. Happens to be the
+# timestamp of the first commit to repo, 2014/5/9 17:48:50.
+TEST_SEED_TIME=1399672130
+
 # Do this before "set -e" so "which" failing is not fatal.
 PNGOPTIMIZER="$(which optipng)"
 
@@ -15,9 +20,9 @@ while (( "$#" )); do
   echo $INFILE | grep -qs ' ' && echo space in filename detected && exit 1
   EVTFILE="${INFILE%.*}.evt"
   if [ -f "$EVTFILE" ]; then
-    out/Debug/pdfium_test --send-events --png $INFILE
+    out/Debug/pdfium_test --send-events --time=$TEST_SEED_TIME --png $INFILE
   else
-    out/Debug/pdfium_test --png $INFILE
+    out/Debug/pdfium_test --time=$TEST_SEED_TIME --png $INFILE
   fi
   RESULTS="$INFILE.*.png"
   for RESULT in $RESULTS ; do
diff --git a/testing/tools/test_runner.py b/testing/tools/test_runner.py
index ecd87ad082..43dc578a90 100644
--- a/testing/tools/test_runner.py
+++ b/testing/tools/test_runner.py
@@ -17,6 +17,11 @@ import gold
 import pngdiffer
 import suppressor
 
+# Arbitrary timestamp, expressed in seconds since the epoch, used to make sure
+# that tests that depend on the current time are stable. Happens to be the
+# timestamp of the first commit to repo, 2014/5/9 17:48:50.
+TEST_SEED_TIME = "1399672130"
+
 class KeyboardInterruptError(Exception): pass
 
 # Nomenclature:
@@ -132,14 +137,16 @@ class TestRunner:
     txt_path = os.path.join(self.working_dir, input_root + '.txt')
 
     with open(txt_path, 'w') as outfile:
-      cmd_to_run = [self.pdfium_test_path, '--send-events', pdf_path]
+      cmd_to_run = [self.pdfium_test_path, '--send-events',
+                    '--time=' + TEST_SEED_TIME, pdf_path]
       subprocess.check_call(cmd_to_run, stdout=outfile)
 
     cmd = [sys.executable, self.text_diff_path, expected_txt_path, txt_path]
     return common.RunCommand(cmd)
 
   def TestPixel(self, input_root, pdf_path, use_ahem):
-    cmd_to_run = [self.pdfium_test_path, '--send-events', '--png', '--md5']
+    cmd_to_run = [self.pdfium_test_path, '--send-events', '--png', '--md5',
+                  '--time=' + TEST_SEED_TIME]
 
     if self.oneshot_renderer:
       cmd_to_run.append('--render-oneshot')