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* extract_actions.py now parses action-suffix tags and creates and returns the ↵mahmadi2015-11-063-16/+528
| | | | | | | | | | | | new actions along with the existing ones Signed-off-by: mahmadi <mahmadi@chromium.org> BUG=552547 Review URL: https://codereview.chromium.org/1413833009 Cr-Commit-Position: refs/heads/master@{#358430}
* Enable UMA reporting for V8.ErrorsThrownPerContexthablich2015-11-061-0/+9
| | | | | | | | | | | | | This metric will be collected when https://codereview.chromium.org/1413503007/ lands in Chromium. BUG=chromium:546603 R=asvitkine@chromium.org,rkaplow@chromium.org Review URL: https://codereview.chromium.org/1414283008 Cr-Commit-Position: refs/heads/master@{#358426}
* [Media Router] Replace --enable-media-router with trivalue switchimcheng2015-11-061-0/+1
| | | | | | | | | | | | | | | | | We need a way for users to explicitly disable Media Router if it were enabled by experiment. This is currently not possible since Media Router uses FeatureSwitch, and --enable-media-router is considered a "legacy" switch, which means explicit disabling that overrides experiment value is not supported (because the fallback value is to disable). Changing to a tri value flag (1, 0, default) will solve this problem and allow explicit enabling/disabling of MediaRouter overriding experiment group. BUG=552144 Review URL: https://codereview.chromium.org/1420423008 Cr-Commit-Position: refs/heads/master@{#358422}
* Remove support for delegating to an existing version of product.zmin2015-11-061-1/+0
| | | | | | | | | | Since there are no products other that Chrome, it is better to fail with HIGHER_VERSION_EXISTS. This is largely a revert of r164040. BUG=545181 Review URL: https://codereview.chromium.org/1429263002 Cr-Commit-Position: refs/heads/master@{#358353}
* Better reuse ShaperCache instanceseae2015-11-061-0/+8
| | | | | | | | | | | | | | This introduces a new cache of ShaperCache instances to FontCache, which manages the life time of said cache and purges it as needed. This allows ShaperCache instances to be reused across FontDescriptions, resulting in significantly higher cache hit rates and thus better layout performance. R=drott@chromium.org BUG=545147 Review URL: https://codereview.chromium.org/1411103009 Cr-Commit-Position: refs/heads/master@{#358321}
* Count usage of <meter> with various -webkit-appearance values.tkent2015-11-061-0/+7
| | | | | | | | | BUG=51182 TBR=isherman@chromium.org Review URL: https://codereview.chromium.org/1415573015 Cr-Commit-Position: refs/heads/master@{#358294}
* Add video metrics from webrtc to histograms.xml.asapersson2015-11-061-0/+22
| | | | | | | | | | - send-side delay stats for sent video streams BUG=512752 Review URL: https://codereview.chromium.org/1423713016 Cr-Commit-Position: refs/heads/master@{#358290}
* Implement media engagement detection for the site engagement service.dominickn2015-11-061-0/+2
| | | | | | | | | | | | | This CL refactors engagement tracking into an abstract base class, with subclasses for user input and media playing detection. Media play and pause events are now periodically observed and contribute to site engagement. BUG=464234 Review URL: https://codereview.chromium.org/1427913002 Cr-Commit-Position: refs/heads/master@{#358254}
* [WKWebView] report CertVerifier and SecTrust verification mismatch.eugenebut2015-11-061-0/+19
| | | | | | | | | | | | | | SecTrust API is used for making load/no-load decision and CertVerifier is used for getting the reason of verification failure. It is expected that mismatch will happen for those 2 approaches (e.g. SecTrust API considers cert as good, but CertVerifier considers same cert as bad). This metric helps to understand how common mismatches are. BUG=535699 Review URL: https://codereview.chromium.org/1430953003 Cr-Commit-Position: refs/heads/master@{#358241}
* [ios] UMA metric to report cache hit/miss for WKWebView cert verification.eugenebut2015-11-061-0/+16
| | | | | | | | | | | | WKWebView Web Controller has a cache of pending cert verification results to avoid extra verifications when presenting SSL interstitial. This metric helps to understand whether or not cache miss is possible. BUG=541736 Review URL: https://codereview.chromium.org/1414793014 Cr-Commit-Position: refs/heads/master@{#358240}
* Make mouse wheel events trigger WebContentsObserver::DidGetUserInteraction.dominickn2015-11-061-0/+1
| | | | | | | | | | | | | | | | | | | | | DidGetUserInteraction() is called for mouse clicks, keypresses, and gesture taps. This CL additionally calls it for mouse wheel events. Impact on scrolling performance is minimised by calling DidGetUserInteraction only at the start of a series of mouse wheel events; any further events which occur less than 0.1 seconds after a previous mouse wheel do not trigger the callback. This CL also allows the site engagement service to correctly log and register mouse wheel events. BUG=548011,464234 Committed: https://crrev.com/13ce0f2bf5ad77c9fbb272bd9f3736cae4a80d0b Cr-Commit-Position: refs/heads/master@{#357963} Review URL: https://codereview.chromium.org/1407053010 Cr-Commit-Position: refs/heads/master@{#358226}
* Add access count and time-since-accessed histograms to temp storage eviction.calamity2015-11-061-0/+16
| | | | | | | | | | | | This CL adds the Quota.EvictedOriginAccessCount and Quota.EvictedOriginTimeSinceAccess histograms that track how many time an evicted origin has been used and how long since it has been used respectively. BUG=542075 Review URL: https://codereview.chromium.org/1424653002 Cr-Commit-Position: refs/heads/master@{#358210}
* [Autofill] Split out "autofilled none" metric by suggestions surfaced or notsebsg2015-11-051-4/+18
| | | | | | | | | | Also took the opportunity to take out all the autofill form submitted states metric from UserHappiness and put them in a mutually exclusive histogram. BUG=540507 Review URL: https://codereview.chromium.org/1407953008 Cr-Commit-Position: refs/heads/master@{#358106}
* cc: Add UMA histogram for compositor-thread draw property updatesajuma2015-11-051-0/+18
| | | | | | | | | | | | | | | | This adds histograms for time spent updating draw properties on the compositor thread. This will allow us to compare the performance of CalcDrawProps to property trees on real pages (after compositor-thread property trees are enabled). The broswer and renderer compositors each get a separate histogram. BUG=524142 CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/1413523008 Cr-Commit-Position: refs/heads/master@{#358082}
* Adding more UMA stats tied to existing Media.Audio.InputStartupSuccessMachenrika2015-11-051-0/+18
| | | | | | | | BUG=549021 Review URL: https://codereview.chromium.org/1428213002 Cr-Commit-Position: refs/heads/master@{#358035}
* Revert "Make mouse wheel events trigger ↵cschuet2015-11-051-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | WebContentsObserver::DidGetUserInteraction." Sheriff reverting CL This CL broke Chromium/chromium-rel-linux/sizes/chrome-si/initializers by introducing another static initializer: render_widget_host_impl.cc _GLOBAL__sub_I_render_widget_host_impl.cc+0xf render_widget_host_impl.cc base::time_internal::FromCheckedNumeric(base::internal::CheckedNumeric<long long>) TBR=dominickn NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=464234 This reverts commit 13ce0f2bf5ad77c9fbb272bd9f3736cae4a80d0b. Review URL: https://codereview.chromium.org/1410333014 Cr-Commit-Position: refs/heads/master@{#358033}
* Revert "Implement media engagement detection for the site engagement service."cschuet2015-11-051-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | sheriff reverting CL This CL depends on https://codereview.chromium.org/1407053010 which broke Chromium/chromium-rel-linux/sizes / chrome-si / initializers by introducing another static initializer: render_widget_host_impl.cc _GLOBAL__sub_I_render_widget_host_impl.cc+0xf render_widget_host_impl.cc base::time_internal::FromCheckedNumeric(base::internal::CheckedNumeric<long long>) TBR=dominckn@chromium.org NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=464234 This reverts commit 8658a8950b57449582033d6a8085e06fc34aa8c7. Review URL: https://codereview.chromium.org/1410993013 Cr-Commit-Position: refs/heads/master@{#358031}
* WebFonts: Count FontFace usage in addition to CSS @font-face ruletoyoshim2015-11-051-0/+1
| | | | | | | | | | | Let's count FontFace constructor's usage to be compared with @font-face rule usage. BUG=n/a Review URL: https://codereview.chromium.org/1428093006 Cr-Commit-Position: refs/heads/master@{#357998}
* Implement media engagement detection for the site engagement service.dominickn2015-11-051-0/+2
| | | | | | | | | | | | | This CL refactors engagement tracking into an abstract base class, with subclasses for user input and media playing detection. Media play and pause events are now periodically observed and contribute to site engagement. BUG=464234 Review URL: https://codereview.chromium.org/1427913002 Cr-Commit-Position: refs/heads/master@{#357978}
* Make mouse wheel events trigger WebContentsObserver::DidGetUserInteraction.dominickn2015-11-051-0/+1
| | | | | | | | | | | | | | | | | | DidGetUserInteraction() is called for mouse clicks, keypresses, and gesture taps. This CL additionally calls it for mouse wheel events. Impact on scrolling performance is minimised by calling DidGetUserInteraction only at the start of a series of mouse wheel events; any further events which occur less than 0.1 seconds after a previous mouse wheel do not trigger the callback. This CL also allows the site engagement service to correctly log and register mouse wheel events. BUG=548011,464234 Review URL: https://codereview.chromium.org/1407053010 Cr-Commit-Position: refs/heads/master@{#357963}
* bluetooth: Implement requestDevice by name or name prefixortuno2015-11-041-0/+1
| | | | | | | | | | | | Based on: https://github.com/WebBluetoothCG/web-bluetooth/pull/174 Implementation of requestDevice by name or namePrefix. BUG=546141 Review URL: https://codereview.chromium.org/1415533006 Cr-Commit-Position: refs/heads/master@{#357926}
* ipc: Add more UMA metrics for AttachmentBrokerUnprivileged.erikchen2015-11-041-0/+3
| | | | | | | | BUG=NONE Review URL: https://codereview.chromium.org/1419203006 Cr-Commit-Position: refs/heads/master@{#357925}
* Add "Enable Weave pairing" flagvitalybuka2015-11-041-0/+1
| | | | | | | | | | | | | Command line switch is already there. Switch name was chosen to match implementation, flag name to match user visible changes. R=mpearson@chromium.org BUG=524788 Review URL: https://codereview.chromium.org/1425393008 Cr-Commit-Position: refs/heads/master@{#357888}
* Adding V8 histograms for starting and incrementally finalizing marking.hpayer2015-11-041-0/+12
| | | | | | | | Added metrics: https://codereview.chromium.org/1431443002 Review URL: https://codereview.chromium.org/1417573004 Cr-Commit-Position: refs/heads/master@{#357752}
* UMA: Add Histograms Descriptions for History In-Memory Indexesmpearson2015-11-041-0/+93
| | | | | | | | | | | | | | | (both for the in-memory DB and the in-memory URL index) Copied these descriptions from the internal repository. I plan to revise them a bit in a later changelist. I figured a copy-submit-modify-submit process was better for tracking diffs and history. BUG= Review URL: https://codereview.chromium.org/1432573003 Cr-Commit-Position: refs/heads/master@{#357678}
* [Offline pages] Show Edit button on Viewing offline page snackbarfgorski2015-11-031-0/+26
| | | | | | | | | | | | * Adding edit button to a snackbar: "Viewing an offline copy [Edit]" * Fixing calls to RecordUserAction.record in EB EditActivity BUG=491352 Review URL: https://codereview.chromium.org/1428523004 Cr-Commit-Position: refs/heads/master@{#357671}
* Displaying "simplify page" check box on print preview by default.mvendramini2015-11-031-0/+1
| | | | | | | | | | | | | | And also removing the "simplifiable page" detection heuristics from consideration when displaying the "simplify page" check box on print preview. Also adding a cmdline and UI switch to disable it (--disable-print-preview-simplify and accompanying UI switch at chrome://flags) R=thakis@chromium.org, nyquist@chromium.org, vitalybuka@chromium.org, thestig@chromium.org, mdjones@chromium.org, bengr@chromium.org, isherman@chromium.org, mpearson@chromium.org BUG=490809 Review URL: https://codereview.chromium.org/1419063002 Cr-Commit-Position: refs/heads/master@{#357661}
* [Android] Add histograms for progress bar updates.kkimlabs2015-11-031-0/+20
| | | | | | | | | | | | | | | | Add two histograms to monitor progress bar animation updates in the real world: - Omnibox.ProgressBarBreakPointUpdateCount: Progress bar break point count. - Omnibox.ProgressBarUpdateCount: Raw progress bar frame count. If there is no animation, it matches ProgressBarBreakPointUpdateCount. BUG=547860 Review URL: https://codereview.chromium.org/1407113006 Cr-Commit-Position: refs/heads/master@{#357654}
* Add UMA histogram for the size of the shortcuts databasempearson2015-11-031-0/+8
| | | | | | | | BUG= Review URL: https://codereview.chromium.org/1426863007 Cr-Commit-Position: refs/heads/master@{#357630}
* Add (another) Omnibox Histogram Suffixmpearson2015-11-031-0/+1
| | | | | | | | | | | | When I replaced Omnibox.QueryTime (which uses suffixes to generate a list of histograms) with Omnibox.QueryTime2, I forgot to update the suffix section of histograms.xml with the new histogram prefix. BUG= Review URL: https://codereview.chromium.org/1429783002 Cr-Commit-Position: refs/heads/master@{#357626}
* Added field trial for enabling AppContainer and a chrome://flags entry.forshaw2015-11-031-0/+2
| | | | | | | | | | | This CL adds support for field trials for enabling the AppContainer lockdown policy as well as exposing the setting via the chrome://flags page. BUG=455496 Review URL: https://codereview.chromium.org/1407883005 Cr-Commit-Position: refs/heads/master@{#357620}
* [SafeBrowsing] Conditionalize unverified download blocking on whitelist.asanka2015-11-031-0/+22
| | | | | | | | | | | | | | | | | | Update the policy for handling unverified downloads to allow downloads that are requested by a document that's whitelisted. The whitelist being used is the SafeBrowsing download whitelist and likely represents legitimate downloads. The requesting document is determined based on the originator of the file chooser request. This originator is currently furnished by the renderer and, as such, considered potentially tainted in the event of a renderer compromise. BUG=533579 Review URL: https://codereview.chromium.org/1410423003 Cr-Commit-Position: refs/heads/master@{#357568}
* Add UMA histogram to determine whether EGL display is created with D3D9 or 11jbauman2015-11-031-0/+15
| | | | | | Review URL: https://codereview.chromium.org/1410053005 Cr-Commit-Position: refs/heads/master@{#357536}
* Propagate scrolling/marginwidth/marginheight property values to child frame.lazyboy2015-11-031-0/+1
| | | | | | | | | | | | | | | | | | | | Initially when a frame is created with FrameHostMsg_CreateChildFrame, we send all of these properties in WebFrameOwnerProperties struct. Later on, if any of these properties change, upon receiving a didChangeFrameOwnerProperties message from blink, we update our FTN data structure. Once the browser process sees such a message, it notifies the child renderer process with FrameMsg_SetFrameOwnerProperties. The renderer then would store them as the frame's FrameOwner properties. The blink part of this CL started here: https://chromiumcodereview.appspot.com/1319863006/ and it was later merged here. Keeping the reference for initial codereview comments. BUG=524725 Review URL: https://codereview.chromium.org/1307013004 Cr-Commit-Position: refs/heads/master@{#357503}
* Track offline page save timejianli2015-11-031-0/+7
| | | | | | | | BUG=491352 Review URL: https://codereview.chromium.org/1425253002 Cr-Commit-Position: refs/heads/master@{#357477}
* reland 3: "mac: Run A/B experiment on SharedMemory mechanism for resource ↵erikchen2015-11-021-0/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | buffers." The second reland still induced flaky crashes in GPU conformance tests related to over-releasing a scoped_refptr<MessageAttachment>. This CL should have fixed the problem: https://codereview.chromium.org/1408793008/. I can reproduce the failure non-deterministically locally. I get a crash every 2-3 runs of the ogles conformance tests. With the CL I mentioned above, I've had 20 runs with no crashes. > The CL changes the default behavior of resource buffer to use a Mach-backed > SharedMemory region. This CL adds a field trial to measure the effect of Mach vs > POSIX backed SharedMemory regions. > > BUG=547261, 466437 > Committed: https://crrev.com/e0e2fd398f3d07c8eebbe662d71a0f9286862476 > Cr-Commit-Position: refs/heads/master@{#356513} BUG=547261, 466437 TBR=mark@chromium.org, isherman@chromium.org, asvitkine@chromium.org, avi@chromium.org Review URL: https://codereview.chromium.org/1420203008 Cr-Commit-Position: refs/heads/master@{#357407}
* QUIC - mark Net.QuicSession.Connect*ForHTTP histograms as obsolete.rtenneti2015-11-021-1/+5
| | | | | | | | | | | | | | Code for the following histogram was deleted a while back, there was no data for the following two histograms. Net.QuicSession.HandshakeRoundTripsForHTTP Net.QuicSession.HandshakeRoundTripsForHTTPS BUG=549278 R=asvitkine@chromium.org, rch@chromium.org Review URL: https://codereview.chromium.org/1406153012 Cr-Commit-Position: refs/heads/master@{#357391}
* Absolute Device Orientation API: blink implementation.timvolodine2015-11-021-0/+4
| | | | | | | | | | | | | Implement blink classes for the 'deviceorientationabsolute' event. Also add and update layout tests and UseCounters. The 'ondeviceorientationabsolute' event listener is currently exposed behind the experimental features flag. BUG=520546 Review URL: https://codereview.chromium.org/1416123002 Cr-Commit-Position: refs/heads/master@{#357374}
* RAPPOR test infrastructure + implementation in page_load_metricscsharrison2015-11-021-0/+42
| | | | | | | | | | | | | | | | | This is a merge of these two CLs https://codereview.chromium.org/1386493002/ https://codereview.chromium.org/1374363002/ This adds a RAPPOR metric tracking the time to the first contentful paint (i.e. first image/text painted). We group eTLD+1's into a coarse timing histogram. These were both previously reverted due to a use-after-free, which was fixed here https://codereview.chromium.org/1394953003/ BUG=538217 Review URL: https://codereview.chromium.org/1419663002 Cr-Commit-Position: refs/heads/master@{#357359}
* Create an experiment to study whether too many bindings cause NAT failure.guoweis2015-11-011-0/+35
| | | | | | | | | | | | | | | | | In this experiment, we're trying to study the impact to NAT by the number of bindings created in short intervals. The stunprober will send 1 ping to each server. There will be total |rounds| of probers. They will be grouped into batches. For example, we'll have the first N probers reporting the success rate of total recv over total send as the first batch, the next N as the 2nd batch. Each batch will report its own UMA. This way, we could observe whether the later batch has higher failure rate than the initial ones. The list of important parameters will be 1. the interval b/w the pings 2. the batch size 3. the total rounds This depends on ongoing CL https://codereview.webrtc.org/1422593002 BUG=549639 Review URL: https://codereview.chromium.org/1417663004 Cr-Commit-Position: refs/heads/master@{#357293}
* Adaptive splash layouts for web appsdfalcantara2015-10-311-0/+1
| | | | | | | | | | | | | | | | | | | | Makes it possible for web apps to have three different types of splash screens, keyed on the quality of the image used for the splash screen. * Web app related dimensions are renamed to be more consistent with all of the new dimensions needed, leading to minor changes to various web app related classes. * Changes WebappActivity#initializeSplashScreen to create an empty RelativeLayout when first called. The splash screen is changed and the controls for the layout are inflated when the splash screen image is retrieved. BUG=532563 Review URL: https://codereview.chromium.org/1414113007 Cr-Commit-Position: refs/heads/master@{#357270}
* Corrects action source enum in docked windows histogramvarkha2015-10-301-2/+3
| | | | | | | | | | BUG=NONE TEST=open UMA for Ash.Dock.ActionSource. DockedActionSource column should include "Keyboard" Review URL: https://codereview.chromium.org/1424353002 Cr-Commit-Position: refs/heads/master@{#357230}
* Add ReloadToClose metric.georgesak2015-10-301-0/+8
| | | | | | | | BUG= Review URL: https://codereview.chromium.org/1414093005 Cr-Commit-Position: refs/heads/master@{#357226}
* Revert "reland 2: "mac: Run A/B experiment on SharedMemory mechanism for ↵erikchen2015-10-301-18/+0
| | | | | | | | | | | | | | | | | | resource buffers."" This reverts commit 91e69f97803b08f998079bd8ec4729b30e346fbb. Still causing problems on GPU conformance tests: http://build.chromium.org/p/chromium.gpu/builders/Mac%20Retina%20Debug/builds/40564/steps/webgl_conformance_tests/logs/stdio http://build.chromium.org/p/chromium.gpu/builders/Mac%20Retina%20Debug/builds/40570/steps/webgl_conformance_tests/logs/WebglConformance.conformance_ogles_GL_smoothstep_smoothstep_001_to_006 BUG=547261, 466437 TBR=mark@chromium.org, isherman@chromium.org, asvitkine@chromium.org, avi@chromium.org NOTRY=true Review URL: https://codereview.chromium.org/1426663006 Cr-Commit-Position: refs/heads/master@{#357194}
* Add missing owners/descriptions from internal file. Pair with cr/106714672 ↵zmin2015-10-301-14/+23
| | | | | | | | which removes these actions from that file. Review URL: https://codereview.chromium.org/1410313007 Cr-Commit-Position: refs/heads/master@{#357193}
* Several Site Details / Memory metrics fixesnick2015-10-301-0/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Fix possible O(n^4) worst case behavior (processes x widgets x frames x siteinstances) for stats gathering. - Show subframe-only processes in about:memory, which also causes them to be reported in SiteIsolation.CurrentRendererProcessCount. - Because SiteIsolation.CurrentRendererProcessCount is fixed, we need a new family of metrics, SiteIsolation.IsolateNothing*, which simulates the process-per-siteinstance process model. In tests, IsolateNothing is expected to have the value that CurrentRenderProcessCount used to. - Implement a more correct treatment of site isolation stats, which looks at parent/child transitions and handles ProcessPerSite properly. This is required for IsolateNothing to work correctly. Since options for walking the frame tree outside of content are pretty limited, this uses WebContents::ForEachFrame and (!) memoization. - Eliminate WebContents::GetSitesInTab; move its about:blank logic into the new frametree walking code in SiteDetails, which was the only caller. BUG=454526,542909 TEST=browser_tests Review URL: https://codereview.chromium.org/1406133002 Cr-Commit-Position: refs/heads/master@{#357178}
* Revert "Record time for UI task to execute under 1/60s"gab2015-10-301-0/+18
| | | | | | | | | | This more or less reverts commit 735b8fd7da4f08e3c85cb0794d34a9a773a3fa5f. BUG=549161 Review URL: https://codereview.chromium.org/1422773003 Cr-Commit-Position: refs/heads/master@{#357175}
* Background tracing: Disable when highres clock is not availableoysteine2015-10-301-0/+1
| | | | | | | | | R=simonhatch BUG=548756 Review URL: https://codereview.chromium.org/1408243009 Cr-Commit-Position: refs/heads/master@{#357160}
* Adds Media.Audio.InputStartupSuccessMac UMA stat for Mac OS Xhenrika2015-10-301-0/+8
| | | | | | | | BUG=549021 Review URL: https://codereview.chromium.org/1407333005 Cr-Commit-Position: refs/heads/master@{#357129}
* Remove RC4 by default.davidben2015-10-301-9/+14
| | | | | | | | | | | | | | | | | | | | RC4 may still be re-enabled via the RC4Enabled administrative policy, until sometime around September. Also control it via a field trial so we still have an escape hatch should something catastrophic happen. Keep the deprecated cipher suite fallback around (rename the parameter since I got the naming convention wrong) since it's still got the IIS AES-GCM workaround in it, and it will be used in not too long for DHE_RSA instead. BUG=375342 TEST=Loading https://rc4.badssl.com/ fails with ERR_SSL_VERSION_OR_CIPHER_MISMATCH Relaunching Chrome with --force-fieldtrials=RC4Ciphers/Enabled/ makes that page succeed. Relaunching Chrome after setting the RC4Enabled polcy to true makes that page succeed. (Note: press refresh when loading the site to make sure it's not cached.) Review URL: https://codereview.chromium.org/1422293002 Cr-Commit-Position: refs/heads/master@{#357114}