Internal: b/38170831

I took a stab at adding this:
https://codereview.chromium.org/2876253002/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/60fae58468c10337e6538d8334034d590bbc86da

commit 60fae58468c10337e6538d8334034d590bbc86da
Author: pauljensen <pauljensen@chromium.org>
Date: Wed May 17 14:37:32 2017

[Cronet] Add ExperimentalCronetEngine.Builder.setThreadPriority() API

This API allows setting the thread priority of Cronet's internal main thread.

BUG= 721519 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_cronet_tester

Review-Url: https://codereview.chromium.org/2876253002
Cr-Commit-Position: refs/heads/master@{#472449}

[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/api.txt
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/api/src/org/chromium/net/ExperimentalCronetEngine.java
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/api/src/org/chromium/net/ICronetEngineBuilder.java
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/api_version.txt
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/java/src/org/chromium/net/impl/CronetEngineBuilderImpl.java
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/java/src/org/chromium/net/impl/JavaCronetEngine.java
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/java/src/org/chromium/net/impl/JavaCronetEngineBuilderImpl.java
[modify] https://crrev.com/60fae58468c10337e6538d8334034d590bbc86da/components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java

Should be available in next week's dev channel release.

Re-open as iOS could use an API like this also.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The API for setting thread priority is available in Cronet for Android:

        /**
         * Sets the thread priority of Cronet's internal thread.
         *
         * @param priority the thread priority of Cronet's internal thread.
         *        A Linux priority level, from -20 for highest scheduling
         *        priority to 19 for lowest scheduling priority. For more
         *        information on values, see
         *        {@link android.os.Process#setThreadPriority(int, int)} and
         *        {@link android.os.Process#THREAD_PRIORITY_DEFAULT
         *        THREAD_PRIORITY_*} values.
         * @return the builder to facilitate chaining.
         */
        public Builder setThreadPriority(int priority) {
            mBuilderDelegate.setThreadPriority(priority);
            return this;
        }


as well as iOS:

// Sets priority of the network thread. The |priority| should be a
// floating point number between 0.0 to 1.0, where 1.0 is highest priority.
// This method can be called multiple times before or after |start| method.
+ (void)setNetworkThreadPriority:(double)priority;