Add concept of priority to BottomSheetContent

This patch adds the concept of priority to content that can be shown
in the bottom sheet. Currently only two priorities are supported: HIGH
and LOW.

BUG=821568

Change-Id: Id2473a48618b5095ab9b1cca20831c7547c4d36d
Reviewed-on: https://chromium-review.googlesource.com/969063
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545193}

chrome/android/java/src/org/chromium/chrome/browser/contextual_suggestions/ContextualSuggestionsBottomSheetContent.java

@@ -7,6 +7,7 @@ package org.chromium.chrome.browser.contextual_suggestions;
 import android.view.View;
 
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet.BottomSheetContent;
+import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet.ContentPriority;
 
 /** A {@link BottomSheetContent} that displays contextual suggestions. */
 public class ContextualSuggestionsBottomSheetContent implements BottomSheetContent {
@@ -48,4 +49,9 @@ public class ContextualSuggestionsBottomSheetContent implements BottomSheetConte
     public boolean applyDefaultTopPadding() {
         return false;
     }
+
+    @Override
+    public @ContentPriority int getPriority() {
+        return ContentPriority.LOW;
+    }
 }

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

@@ -96,6 +96,14 @@ public class BottomSheet
         int NAVIGATION = 4;
     }
 
+    /** The different priorities that the sheet's content can have. */
+    @IntDef({ContentPriority.HIGH, ContentPriority.LOW})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface ContentPriority {
+        int HIGH = 0;
+        int LOW = 1;
+    }
+
     /**
      * The base duration of the settling animation of the sheet. 218 ms is a spec for material
      * design (this is the minimum time a user is guaranteed to pay attention to something).
@@ -278,6 +286,12 @@ public class BottomSheet
          * @return Whether the default top padding should be applied to the content view.
          */
         boolean applyDefaultTopPadding();
+
+        /**
+         * @return The priority of this content.
+         */
+        @ContentPriority
+        int getPriority();
     }
 
     /**