[Android] HC++ plumbing. (#162407)

We'll need the JNI fascade to create the surface transaction for HC++
mode. Split into a separate PR so that the "real" HC++ PR isn't 5000
lines long.
https://dart.googlesource.com/external/github.com/flutter/flutter/+/1eecbf12568d7f48be65ede5cebe73180eae2b40

DEPS

diff --git a/DEPS b/DEPS
index c99d2f7..69d5b51 100644
--- a/DEPS
+++ b/DEPS
@@ -239,7 +239,7 @@
 deps = {
   'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '6000ee0e88c4a0fcd03a9fff9f764cdc389b035c',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + 'fffbf663ff34ea292b7e7160a16b106d963202ff',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '1eecbf12568d7f48be65ede5cebe73180eae2b40',
 
   'flutter/engine/src/flutter/third_party/depot_tools':
   Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '580b4ff3f5cd0dcaa2eacda28cefe0f45320e8f7',

commits.json

diff --git a/commits.json b/commits.json
index fb1868f..7f7c6b6 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
-  "flutter":"fffbf663ff34ea292b7e7160a16b106d963202ff",
+  "flutter":"1eecbf12568d7f48be65ede5cebe73180eae2b40",
   "flutter/engine/src/flutter/third_party/dart":"6000ee0e88c4a0fcd03a9fff9f764cdc389b035c"
 }
\ No newline at end of file