Add diff api to scm.
Add diff api to scm.

googlearchive/chromedeveditor,b0dh1sattva/chromedeveditor,devoncarew/spark,ussuri/chromedeveditor,ussuri/chromedeveditor,ussuri/chromedeveditor,beaufortfrancois/chromedeveditor,googlearchive/chromedeveditor,valmzetvn/chromedeveditor,b0dh1sattva/chromedeveditor,valmzetvn/chromedeveditor,yikaraman/chromedeveditor,devoncarew/spark,b0dh1sattva/chromedeveditor,modulexcite/chromedeveditor,yikaraman/chromedeveditor,valmzetvn/chromedeveditor,valmzetvn/chromedeveditor,hxddh/chromedeveditor,beaufortfrancois/chromedeveditor,modulexcite/chromedeveditor,beaufortfrancois/chromedeveditor,b0dh1sattva/chromedeveditor,vivalaralstin/chromedeveditor,vivalaralstin/chromedeveditor,2947721120/chromedeveditor,2947721120/choredev,hxddh/chromedeveditor,2947721120/choredev,googlearchive/chromedeveditor,2947721120/choredev,b0dh1sattva/chromedeveditor,valmzetvn/chromedeveditor,beaufortfrancois/chromedeveditor,valmzetvn/chromedeveditor,2947721120/choredev,vivalaralstin/chromedeveditor,yikaraman/chromedeveditor,googlearchive/chromedeveditor,valmzetvn/chromedeveditor,2947721120/choredev,modulexcite/chromedeveditor,modulexcite/chromedeveditor,ussuri/chromedeveditor,beaufortfrancois/chromedeveditor,2947721120/choredev,devoncarew/spark,yikaraman/chromedeveditor,yikaraman/chromedeveditor,vivalaralstin/chromedeveditor,2947721120/chromedeveditor,vivalaralstin/chromedeveditor,2947721120/choredev,devoncarew/spark,ussuri/chromedeveditor,ussuri/chromedeveditor,b0dh1sattva/chromedeveditor,modulexcite/chromedeveditor,vivalaralstin/chromedeveditor,googlearchive/chromedeveditor,2947721120/chromedeveditor,2947721120/chromedeveditor,hxddh/chromedeveditor,modulexcite/chromedeveditor,2947721120/chromedeveditor,yikaraman/chromedeveditor,2947721120/chromedeveditor,beaufortfrancois/chromedeveditor,hxddh/chromedeveditor,b0dh1sattva/chromedeveditor,vivalaralstin/chromedeveditor,beaufortfrancois/chromedeveditor,modulexcite/chromedeveditor,googlearchive/chromedeveditor,hxddh/chromedeveditor,hxddh/chromedeveditor,devoncarew/spark,ussuri/chromedeveditor,googlearchive/chromedeveditor,devoncarew/spark,yikaraman/chromedeveditor,hxddh/chromedeveditor,2947721120/chromedeveditor