[Contextual Search] Add a handle to the bar when Chrome Home is enabled

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelBase.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelBase.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelBase.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelBase.java
index eb333010f4cf1a24567d5f3884f525f2749d5d29..43b71b47b06ebd25695c995c5b495abf13c91a5b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelBase.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelBase.java
@@ -90,20 +90,20 @@ abstract class OverlayPanelBase {
      */
     private static final float PROGRESS_BAR_VISIBILITY_THRESHOLD_DP = 10.f;
 
+    /** Ratio of dps per pixel. */
+    protected final float mPxToDp;
+
     /** The height of the Toolbar in dps. */
     private float mToolbarHeight;
 
     /** The height of the Bar when the Panel is peeking, in dps. */
-    private final float mBarHeightPeeking;
+    private float mBarHeightPeeking;
 
     /** The height of the Bar when the Panel is expanded, in dps. */
-    private final float mBarHeightExpanded;
+    private float mBarHeightExpanded;
 
     /** The height of the Bar when the Panel is maximized, in dps. */
-    private final float mBarHeightMaximized;
-
-    /** Ratio of dps per pixel. */
-    protected final float mPxToDp;
+    private float mBarHeightMaximized;
 
     /**
      * The Y coordinate to apply to the Base Page in order to keep the selection
@@ -141,12 +141,11 @@ abstract class OverlayPanelBase {
         mContext = context;
         mPxToDp = 1.f / mContext.getResources().getDisplayMetrics().density;
 
-        mBarHeightPeeking = mContext.getResources().getDimension(
-                R.dimen.overlay_panel_bar_height) * mPxToDp;
-        mBarHeightMaximized = mContext.getResources().getDimension(
-                R.dimen.toolbar_height_no_shadow) * mPxToDp;
-        mBarHeightExpanded =
-                Math.round((mBarHeightPeeking + mBarHeightMaximized) / 2.f);
+        mBarHeightPeeking =
+                mContext.getResources().getDimension(R.dimen.overlay_panel_bar_height) * mPxToDp;
+        mBarHeightMaximized =
+                mContext.getResources().getDimension(R.dimen.toolbar_height_no_shadow) * mPxToDp;
+        mBarHeightExpanded = Math.round((mBarHeightPeeking + mBarHeightMaximized) / 2.f);
 
         mBarMarginSide = BAR_ICON_SIDE_PADDING_DP;
         mProgressBarHeight = PROGRESS_BAR_HEIGHT_DP;
@@ -1140,6 +1139,54 @@ abstract class OverlayPanelBase {
     }
 
     // ============================================================================================
+    // Bar Handle
+    // ============================================================================================
+    protected int mBarHandleResourceId;
+    protected float mBarHandleOffsetY;
+    protected float mBarPaddingBottom;
+
+    /**
+     * Adds a handle to the bar.
+     * @param barHeightPx The new bar height in px needed to accommodate the handle.
+     */
+    public void addBarHandle(int barHeightPx) {
+        mBarHandleResourceId = R.drawable.toolbar_handle_dark;
+        mBarHeightPeeking = barHeightPx * mPxToDp;
+        mBarHeightMaximized = mBarHeightPeeking;
+        mBarHeightExpanded = mBarHeightPeeking;
+        mHeight = mBarHeightPeeking;
+    }
+
+    /**
+     * @return The resource id for the bar handle.
+     */
+    public int getBarHandleResourceId() {
+        return mBarHandleResourceId;
+    }
+
+    /** @return The y-offset for the bar handle in px. */
+    public float getBarHandleOffsetY() {
+        if (mBarHandleOffsetY == 0.f && mBarHandleResourceId != 0) {
+            mBarHandleOffsetY =
+                    mContext.getResources().getDimension(R.dimen.overlay_panel_bar_handle_offset_y);
+        }
+        return mBarHandleOffsetY;
+    }
+
+    /** @return The bottom padding for the bar in px. */
+    public float getBarPaddingBottom() {
+        // When there is no bar handle, the bar contents are vertically centered. When there is a
+        // bar handle, the contents are displayed below the handle. Bottom padding is needed so that
+        // the contents don't appear too low in the bar when centered in the space beneath the
+        // handle.
+        if (mBarPaddingBottom == 0.f && mBarHandleResourceId != 0) {
+            mBarPaddingBottom =
+                    mContext.getResources().getDimension(R.dimen.overlay_panel_bar_padding_bottom);
+        }
+        return mBarPaddingBottom;
+    }
+
+    // ============================================================================================
     // Test Infrastructure
     // ============================================================================================