Reland [Home] Close the BottomSheet when a URL is loaded on the NTP

chrome/android/java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPageBase.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPageBase.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPageBase.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPageBase.java
index 4515d9746faf7addecc195bb992be1ad7de7410d..66b409bbcee5d559dd8435f75b6330231135cf0f 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPageBase.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPageBase.java
@@ -7,6 +7,7 @@ package org.chromium.chrome.browser.ntp;
 import android.content.Context;
 import android.support.annotation.CallSuper;
 import android.support.annotation.Nullable;
+import android.text.TextUtils;
 import android.view.View;
 import android.view.View.OnClickListener;
 
@@ -24,6 +25,7 @@ import org.chromium.chrome.browser.tab.TabObserver;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheetMetrics;
+import org.chromium.content_public.browser.LoadUrlParams;
 
 /**
  * The base class for the new tab pages displayed in Chrome Home.
@@ -90,6 +92,14 @@ public abstract class ChromeHomeNewTabPageBase implements NativePage {
                 mFadingBackgroundView.setEnabled(true);
                 if (!mTab.isClosing()) mShowOverviewOnClose = false;
             }
+
+            @Override
+            public void onLoadUrl(Tab tab, LoadUrlParams params, int loadType) {
+                // If the NTP is loading, the sheet state will be set to SHEET_STATE_HALF.
+                if (TextUtils.equals(tab.getUrl(), getUrl())) return;
+
+                mBottomSheet.setSheetState(BottomSheet.SHEET_STATE_PEEK, true);
+            }
         };
         mTab.addObserver(mTabObserver);