Ephemeral tab : Several fixes

This CL adds several fixes:
1 - Adds custom height for full state
2 - Fixes a crash when trying to obtain ChromeActivity by using
 ActivityWindowAndroid. This is required especially during text input.

Bug: 998826
Change-Id: Ib9a7bb370c7c230d2ca22064d92f23d1161ae0e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815053Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699867}

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/ephemeraltab/EphemeralTabSheetContent.java

@@ -26,7 +26,7 @@ import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet;
 import org.chromium.components.embedder_support.view.ContentView;
 import org.chromium.content_public.browser.RenderCoordinates;
 import org.chromium.content_public.browser.WebContents;
-import org.chromium.ui.base.WindowAndroid;
+import org.chromium.ui.base.ActivityWindowAndroid;
 
 /**
  * Represents ephemeral tab content and the toolbar, which can be included inside the bottom sheet.
@@ -81,7 +81,7 @@ public class EphemeralTabSheetContent implements BottomSheet.BottomSheetContent
      * bottom sheet.
      */
     private void createThinWebView() {
-        mThinWebView = ThinWebViewFactory.create(mContext, new WindowAndroid(mContext));
+        mThinWebView = ThinWebViewFactory.create(mContext, new ActivityWindowAndroid(mContext));
 
         mSheetContentView = new FrameLayout(mContext);
         mSheetContentView.addView(mThinWebView.getView());
@@ -192,6 +192,11 @@ public class EphemeralTabSheetContent implements BottomSheet.BottomSheetContent
         return true;
     }
 
+    @Override
+    public float getCustomFullRatio() {
+        return 0.9f;
+    }
+
     // TODO(shaktisahu): Provide correct strings for the following methods.
     @Override
     public int getSheetContentDescriptionStringId() {

chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java

@@ -1213,8 +1213,8 @@ public class BottomSheet
      * @return The height of the sheet at the provided state.
      */
     private float getSheetHeightForState(@SheetState int state) {
-        if (mSheetContent != null && mSheetContent.wrapContentEnabled()
-                && state == SheetState.FULL) {
+        if (mSheetContent != null && mSheetContent.wrapContentEnabled() && state == SheetState.FULL
+                && mSheetContent.getCustomFullRatio() == INVALID_HEIGHT_RATIO) {
             ensureContentDesiredHeightIsComputed();
             return mContentDesiredHeight + mToolbarShadowHeight;
         }