Migrate IME state update flow

content/public/android/BUILD.gn

Index: content/public/android/BUILD.gn
diff --git a/content/public/android/BUILD.gn b/content/public/android/BUILD.gn
index ca4005baa1eac333742eb8e3fc8e73416c1fc185..278c8a6d728c1d6b07262f1566629a4d4031326d 100644
--- a/content/public/android/BUILD.gn
+++ b/content/public/android/BUILD.gn
@@ -153,6 +153,7 @@ android_library("content_java") {
     "java/src/org/chromium/content/browser/SpeechRecognition.java",
     "java/src/org/chromium/content/browser/TracingControllerAndroid.java",
     "java/src/org/chromium/content/browser/ViewPositionObserver.java",
+    "java/src/org/chromium/content/browser/ViewUtils.java",
     "java/src/org/chromium/content/browser/WindowAndroidProvider.java",
     "java/src/org/chromium/content/browser/WindowAndroidChangedObserver.java",
     "java/src/org/chromium/content/browser/accessibility/BrowserAccessibilityManager.java",
@@ -223,6 +224,7 @@ android_library("content_java") {
     "java/src/org/chromium/content_public/browser/ContentBitmapCallback.java",
     "java/src/org/chromium/content_public/browser/GestureStateListener.java",
     "java/src/org/chromium/content_public/browser/ImageDownloadCallback.java",
+    "java/src/org/chromium/content_public/browser/ImeEventObserver.java",
     "java/src/org/chromium/content_public/browser/InterfaceRegistrar.java",
     "java/src/org/chromium/content_public/browser/JavaScriptCallback.java",
     "java/src/org/chromium/content_public/browser/LoadUrlParams.java",
@@ -445,7 +447,6 @@ android_library("content_javatests") {
     "javatests/src/org/chromium/content/browser/input/ImeTestUtils.java",
     "javatests/src/org/chromium/content/browser/input/InputDialogContainerTest.java",
     "javatests/src/org/chromium/content/browser/input/SelectPopupTest.java",
-    "javatests/src/org/chromium/content/browser/input/TestImeAdapterDelegate.java",
     "javatests/src/org/chromium/content/browser/picker/DateTimePickerDialogTest.java",
     "javatests/src/org/chromium/content/browser/webcontents/AccessibilitySnapshotTest.java",
     "javatests/src/org/chromium/content/browser/webcontents/WebContentsTest.java",