I wonder if this type of Trend is not possible using Amibroker kind of tools? I know a lot people in this forum use Amibroker. I am sure it should be possible or there should be similar kind of code available.
Remember the excel tool I use cannot be considered professional.
I use excel because I want to Simplify and I also use Options Chain which is not available the way I want in any other tool (OR May be I am not aware of).
So just grab the idea and implement in your own system.
If you still want to use Google Finance data, The code to download the Google Finance Data is available in the tools that I have shared. It is available in all the tools that I had shared like OAT, MTP, OTP, Stock Screener etc... If you know some excel programming you should have figured it out by now