Currently, all Flutter threads are managed by the engine itself. This works for
all threads except the platform thread. On this thread, the engine cannot see
the underlying event multiplexing mechanism. Using the new task runner
interfaces, the engine can relinquish the task of setting up the event
multiplexing mechanism and instead have the embedder provide one for it during
setup.

This scheme is only wired up for the platform thread. But, the eventual goal
is to expose this message loop interoperability for all threads.

NSOpenGLView reshape is annotated with NS_REQUIRES_SUPER. This avoids
build failures when building with `-Wobjc-missing-super-calls`.

Simplifies the build and runtime requirements for the Linux shell.
Since the engine does GL extension lookup manually anway, an extension
loader library isn't necessary.

Instead of requiring a system-level GLFW, build it from source and
statically link it into the Linux shell.

Bugfix:
* Use the `pub` from within the built Dart SDK (not whatever's on
  `$PATH`, if anything).

A few minor improvements:
* Allow running from below the src/ buildroot dir, as it's often
  convenient to work from within the flutter/engine git dir.
* Echo test name before running, for slightly better debuggability.
* Minor line-wrapping for readability.

ffee99d Add asyncExpectThrows<T>() to async_helper.
994f535 [vm/bytecode/compiler] Remove excessive stack overflow checks when inlining
9ea9612 Object can be used in for-in and await for elements.
4555cf7 Convert one more set of tests
a9ee080 [dartdevc] Remove redundant parameters from helper methods
1bbd282 Make analyzer/tool/summary/generate.dart take an IDL path
f127153 [co19] DEPS updated

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2019-03-28 [email protected] Roll third_party/externals/angle2 c240abe..208af3e (3 commits)

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Enables the build of the Windows shell, based on the same GLFW code used
by the current Linux shell.

cf32584 [vm] Support compiling static field initializers and dynamic invocation forwarders from a compilation trace.
3364df5 Fix a bug that led to a divide-by-zero exception
f226f4f Improve type of typed-array load
e5bc8c2 [ VM / Service ] Remove Platform.pathSeparator from test and replace with / to fix Windows failure
0d93a85 [vm/bytecode] Clean component metadata except bytecode when dropping AST
ca2f03c [ VM / Service ] Allow for breakpoints to be set using either file: or package: URIs for packages.

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2019-03-28 [email protected] Roll ../src 83d44af5c208..eb8d3bc0b607 (520 commits)

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