EphemeralTab: Bigger peek panel

This CL makes the ephemeral tab in peeked state 150% larger. Top portion
of the content being loaded as well as the progress bar becomes quite
visible.

Bug: 894619
Change-Id: I2aa5d39a4a9592c07421136c00d74c54b9c916ae
Reviewed-on: https://chromium-review.googlesource.com/c/1349150Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611573}

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/ephemeraltab/EphemeralTabPanel.java

@@ -27,7 +27,9 @@ import org.chromium.ui.resources.ResourceManager;
 
 /**
  * The panel containing an ephemeral tab.
- * TODO(jinsukkim): Make panel height in peeked state bigger to show the progress indicator clearly.
+ * TODO(jinsukkim): Write tests.
+ *                  Add animation effect upon opening ephemeral tab.
+ *                  Bring back the bottom bar animation hidden behind ephemeral tab.
  */
 public class EphemeralTabPanel extends OverlayPanel {
     /** The compositor layer used for drawing the panel. */
@@ -73,12 +75,22 @@ public class EphemeralTabPanel extends OverlayPanel {
                 mActivity, getBarHeight());
     }
 
+    @Override
+    protected float getPeekedHeight() {
+        return getBarHeightPeeking() * 1.5f;
+    }
+
     @Override
     protected float getMaximizedHeight() {
         // Max height does not cover the entire content screen.
         return getTabHeight() * 0.9f;
     }
 
+    @Override
+    public boolean isPanelOpened() {
+        return getHeight() > getPeekedHeight();
+    }
+
     @Override
     public float getProgressBarOpacity() {
         return 1.0f;