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This CL introduces new APIs to suspend/resume the active tasks on the page
of blink. Android webview, devtools, or other projects which use the content
module needs to be able to suspend current active tasks including active javascript,
active timers, defer loadings, and so on. This CL supports to suspend/resume through
the APIs when they want to pause current active tasks. This feature will help us to
save CPU resources, and so on. Besides WebKit2 has been supporting this APIs for
applications which uses WebKitWebView.

TEST: WebContentsImplBrowserTest.PausePageScheduledTasks

Bug: 822564
Change-Id: Icec0390c2dffd676a6079dd9e148feb8a3e859e1
Reviewed-on: https://chromium-review.googlesource.com/952642Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung.kim@lge.com>
Cr-Commit-Position: refs/heads/master@{#547403}