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..f97f467908e0ad2af404f8aed63c22a52cd2777b 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 +2876,21 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
             mFullscreenManager.showControlsTransient();
             updateFullscreenEnabledState();
         }
+
+        // For blimp mode, offset the blimp view by the height of top controls. This will ensure
+        // that the view doesn't get clipped at the bottom of the page and also the touch offsets
+        // would work correctly.
+        if (getBlimpContents() != null && mFullscreenManager != null) {
+            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);
+        }
     }
 
     /**