GM self-test: add option to exercise --writePath and --mismatchPath, but not on bots

gm/tests/run.sh

Index: gm/tests/run.sh
===================================================================
--- gm/tests/run.sh	(revision 9045)
+++ gm/tests/run.sh	(working copy)
@@ -21,6 +21,12 @@
 # TODO(epoger): make it look in Release and/or Debug
 GM_BINARY=out/Debug/gm
 
+# If WRITE_IMAGE_FILES is nonzero, then the self-test will pass --writePath
+# and --mismatchPath arguments to GM.  Currently, for various reasons, we
+# cannot run these arguments on the production buildbots, so this should
+# only be set to nonzero for local testing.
+WRITE_IMAGE_FILES=0
+
 OUTPUT_ACTUAL_SUBDIR=output-actual
 OUTPUT_EXPECTED_SUBDIR=output-expected
 CONFIGS="--config 8888 565"
@@ -62,7 +68,12 @@
 
   rm -rf $ACTUAL_OUTPUT_DIR
   mkdir -p $ACTUAL_OUTPUT_DIR
+
   COMMAND="$GM_BINARY $GM_ARGS --writeJsonSummaryPath $JSON_SUMMARY_FILE"
+  if [ $WRITE_IMAGE_FILES != 0 ]; then
+    COMMAND="$COMMAND --writePath $ACTUAL_OUTPUT_DIR/writePath --mismatchPath $ACTUAL_OUTPUT_DIR/mismatchPath"
+  fi
+
   echo "$COMMAND" >$ACTUAL_OUTPUT_DIR/command_line
   $COMMAND >$ACTUAL_OUTPUT_DIR/stdout 2>$ACTUAL_OUTPUT_DIR/stderr
   echo $? >$ACTUAL_OUTPUT_DIR/return_value
@@ -77,6 +88,17 @@
   grep ^GM: $ACTUAL_OUTPUT_DIR/stderr >$ACTUAL_OUTPUT_DIR/stderr-tmp
   mv $ACTUAL_OUTPUT_DIR/stderr-tmp $ACTUAL_OUTPUT_DIR/stderr
 
+  if [ $WRITE_IMAGE_FILES != 0 ]; then
+    for IMAGEFILE in $(ls $ACTUAL_OUTPUT_DIR/*/*/*.png); do
+      SUM=$(sum $IMAGEFILE)
+      echo "Replaced image bytes with a checksum, because of https://code.google.com/p/chromium/issues/detail?id=169600 ('gcl/upload.py fail to upload binary files to rietveld')" >$IMAGEFILE
+      echo $SUM >> $IMAGEFILE
+    done
+    for MISMATCHDIR in $(ls -d $ACTUAL_OUTPUT_DIR/mismatchPath/*); do
+      echo "Created additional file to make sure directory isn't empty, because self-test cannot handle empty directories." >$MISMATCHDIR/bogusfile
+    done
+  fi
+
   compare_directories $EXPECTED_OUTPUT_DIR $ACTUAL_OUTPUT_DIR
 }