Chromium Blog: May 2011

Chrome Developer Tools: Put JavaScript memory under control

Friday, May 27, 2011

Task ManagerMemory GraphHeap Profilertutorial

[1]: How to invoke the context menu in the Chrome Task Manager:

Windows: Right click on any part of the grid;
Linux: Right click on the grid itself;
Mac: Ctrl+Right click on column headers

Posted by Mikhail Naganov, Software Engineer

WebP in Chrome, Picasa, Gmail With a Slew of New Features and Improvements

Friday, May 20, 2011

Since we WebP image with red edges converted from this PNG original:

Without fancy upsampling: strong stair-like pattern

The easy segment contains lot of disparate signals and can be compressed more than the difficult one, which will be assigned more bits. In this example, the encoder only used two segments. By using even more segments (up to four), WebP is now able to retain many of the original PSNR may be degraded, but the overall visual quality is much improved.

We’ve added simple encoding and decoding example binaries to the Google Instant Previews now store images in WebP to reduce their storage needs.

Users that want to manipulate WebP images can now do so using software developed by the community including Java VP8 decoder. The open-source community has also contributed support for Mac OS X with Gentoo packages and the Apache HTTP Server. On Windows, users who want to view WebP images natively, can download the PNG source, and http://commons.wikimedia.org/wiki/File:A_storm_at_Pors-Loubous.jpg

Posted by Richard Rabbat, Product Manager and Pascal Massimino, Software Engineer

ChromeVox: Built-In Spoken Feedback For Chrome OS

Thursday, May 19, 2011

Cross posted at the experimental.tts API for cross-platform text-to-speech, and the experimental.accessibility API that lets an extension listen for accessibility events in Chrome's menus and toolbars. In turn, ChromeVox exposes a Accessibility help page, and the Chrome extension is available for download from our Wiki page. For now, ChromeVox is targeted at end-users on Chrome OS, but it may also prove a useful tool to web developers using Chrome on all major platforms. We welcome your feedback via our Open Source project website at http://google-axs-chrome.googlecode.com.

Posted by T.V. Raman, Research Scientist

SSL FalseStart Performance Results

Wednesday, May 18, 2011

Last year, Google’s Adam Langley, Nagendra Modadugu, and Bodo Moeller proposed more content providers move to SSL.
Our biggest concern with implementing SSL False Start was backward compatibility. Although nothing in the SSL specification (also known as TLS) explicitly prohibits FalseStart, there was no easy way to know whether it would work with all sites. Speed is great, but if it breaks user experience for even a small fraction of users, the optimization is non-deployable.
To answer this question, we compiled a list of all known https websites from the Google index, and tested SSL FalseStart with all of them. The result of that test was encouraging: 94.6% succeeded, 5% timed out, and 0.4% failed. The sites that timed out were verified to be sites that are no longer running, so we could ignore them.
To investigate the failing sites, we implemented a more robust check to understand how the failures occurred. We disregarded those sites that failed due to certificate failures or problems unrelated to FalseStart. Finally, we discovered that the sites which didn’t support FalseStart were using only a handful of SSL vendors. We reported the problem to the vendors, and most have fixed it already, while the others have fixes in progress. The result is that today, we have a manageable, small list of domains where SSL FalseStart doesn’t work, and we’ve added them to a list within Chrome where we simply won’t use FalseStart. This list is public and posted in the chromium source code. We are actively working to shrink the list and ultimately remove it.
All of this represents a tremendous amount of work with a material gain for Chrome SSL users. We hope that the data will be confirmed by other browser vendors and adopted more widely.¹Measured as the time between the initial TCP SYN packet and the end of the TLS handshake.
Posted by Mike Belshe, Software Engineer

Chrome Web Store in 41 languages and In-App Payments

Friday, May 13, 2011

Graphiclylocalize your existing appsdeveloper discussion groupPosted by Alexandra Levich, Product Manager

Remote debugging with Chrome Developer Tools

Monday, May 9, 2011

Run the Chrome instance that you will be debugging remotely with the remote debugging WebKit blog post. For more information on the remote debugging and Chrome Developer Tools in general, see our documentation page.

Posted by Pavel Feldman, Software Engineer

Updating JavaScript Benchmarks for Modern Browsers

Wednesday, May 4, 2011

SunSpiderKrakencanonicallatest version of KrakenPosted by Mike Belshe, Software Engineer

Adding more yellow to the Mac color scheme

Monday, May 2, 2011

take it for a spin!Posted by Mark Mentovai, Software Engineer

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