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This CL parameterize some tests using this flag. It does 2 things:
1. Move the kCompositorTouchAction flag from content/ to ui/events/blink.
This is because InputHandlerProxy will need to have access to this flag,
and that content/ depends on ui/events/blink.
2. Parameterize necessary tests based on this flag. Tests include:
InputRouterImplTest, TouchActionFilterTest, InputHandlerProxyTest,
TouchActionBrowserTest.

In order to pameterize the InputRouterImplTest, we have to extract a
InputRouterImplTestBase. The reason is that InputRouterImplTest has a
subclass "TouchpadPinchInputRouterImplTest", which is already a
parameterized test depending on another flag.

Bug: 900202
Change-Id: I07e30739ee86aaf8b1840d6e0dccfc504a16b075
Reviewed-on: https://chromium-review.googlesource.com/c/1307833
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604491}