Fixed touch offset for Blimp

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index edbaa1c0980a64a49dd6cdcdce10687735bf9045..700966859bbbcf7a78627e46fccb4497d4d534f9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -23,9 +23,9 @@ import android.view.ContextThemeWrapper;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
-import android.view.ViewGroup.LayoutParams;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.FrameLayout;
+import android.widget.FrameLayout.LayoutParams;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.ApplicationStatus;
@@ -2876,6 +2876,19 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
             mFullscreenManager.showControlsTransient();
             updateFullscreenEnabledState();
         }
+
+        // For blimp, set a top margin equal to the top controls height.
+        if (getBlimpContents() != null && mFullscreenManager != null) {

[Khushal, 2016/09/08 00:59:59]

Can you also do this when we create the BlimpContents, be doubly sure.

[shaktisahu, 2016/09/08 02:19:00]

The BlimpContents is created inside the Tab.initialize() function which is the
first thing to be called after the tab is constructed. So, although both of the
methods are public, it kind of ensures proper initialization order so that blimp
view top margin will be set correctly.

+            ViewGroup blimpView = getBlimpContents().getView();
+            FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) blimpView.getLayoutParams();
+            if (lp == null) {
+                lp = new FrameLayout.LayoutParams(
+                        LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
+            }
+
+            lp.topMargin = mFullscreenManager.getTopControlsHeight();
+            blimpView.setLayoutParams(lp);
+        }
     }
 
     /**