[Home] Record some user actions for the Chrome Home BottomSheet

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

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
index 6549ec5fe1feca81f3b860b7d38edc3b3ba23241..f634239ca001844ced957478ac3a524e538be4f6 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
@@ -182,6 +182,11 @@ public class BottomSheet
          * Called to destroy the BottomSheetContent when it is no longer in use.
          */
         void destroy();
+
+        /**
+         * @return The String to use when recording user metrics related to this content.
+         */
+        String getMetricsName();
     }
 
     /**
@@ -271,6 +276,8 @@ public class BottomSheet
 
         mGestureDetector = new GestureDetector(context, new BottomSheetSwipeDetector());
         mGestureDetector.setIsLongpressEnabled(false);
+
+        new BottomSheetMetrics(this);
     }
 
     @Override
@@ -505,6 +512,11 @@ public class BottomSheet
         } else {
             mDefaultToolbarView.setVisibility(View.VISIBLE);
         }
+
+
+        for (BottomSheetObserver o : mObservers) {
+            o.onSheetContentChanged(mSheetContent);
+        }
     }
 
     /**
@@ -728,6 +740,7 @@ public class BottomSheet
      *                move there instantly.
      */
     public void setSheetState(@SheetState int state, boolean animate) {
+        boolean stateChanged = state != mCurrentState;
         mCurrentState = state;
 
         if (animate) {
@@ -735,6 +748,11 @@ public class BottomSheet
         } else {
             setSheetOffsetFromBottom(getSheetHeightForState(state));
         }
+
+        if (!stateChanged) return;
+        for (BottomSheetObserver o : mObservers) {
+            o.onSheetStateChanged(mCurrentState);
+        }
     }
 
     /**