Convert BottomSheetController to an ActivityTabProvider user

This patch replaces the need for several larger objects in the
BottomSheetController (LayoutManager and TabModelSelector) in favor
of instead using the ActivityTabProvider. This simplifies the logic
in this class.

Change-Id: I001593cfccaadbf1c0e60ceaa7231e203c56a338
Reviewed-on: https://chromium-review.googlesource.com/1211447Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589530}

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

@@ -1403,8 +1403,8 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
 
             ((BottomContainer) findViewById(R.id.bottom_container)).setBottomSheet(mBottomSheet);
 
-            mBottomSheetController = new BottomSheetController(this, getTabModelSelector(),
-                    getCompositorViewHolder().getLayoutManager(), mScrimView, mBottomSheet,
+            mBottomSheetController = new BottomSheetController(this, mActivityTabProvider,
+                    mScrimView, mBottomSheet,
                     getCompositorViewHolder().getLayoutManager().getOverlayPanelManager(),
                     !ChromeFeatureList.isEnabled(ChromeFeatureList.CONTEXTUAL_SUGGESTIONS_BUTTON));
 

chrome/android/javatests/src/org/chromium/chrome/browser/widget/ScrimTest.java

@@ -70,8 +70,8 @@ public class ScrimTest {
 
             mScrim = activity.getScrim();
 
-            mSheetController = new BottomSheetController(activity, activity.getTabModelSelector(),
-                    activity.getCompositorViewHolder().getLayoutManager(), mScrim, mBottomSheet,
+            mSheetController = new BottomSheetController(activity,
+                    activity.getActivityTabProvider(), mScrim, mBottomSheet,
                     activity.getCompositorViewHolder().getLayoutManager().getOverlayPanelManager(),
                     true);
         });

chrome/android/javatests/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheetControllerTest.java

@@ -71,8 +71,8 @@ public class BottomSheetControllerTest {
 
             ScrimView scrim = new ScrimView(mActivityTestRule.getActivity(), null, coordinator);
 
-            mSheetController = new BottomSheetController(activity, activity.getTabModelSelector(),
-                    activity.getCompositorViewHolder().getLayoutManager(), scrim, mBottomSheet,
+            mSheetController = new BottomSheetController(activity,
+                    activity.getActivityTabProvider(), scrim, mBottomSheet,
                     activity.getCompositorViewHolder().getLayoutManager().getOverlayPanelManager(),
                     true);