[Android] Revert bottom controls adjustment for accessory

Since crrev.com/c/1233716, the keyboard accessory doesn't affect the
bottom controls anymore - which is largely correct since it uses a
separate mechanism to reserve that space.
Unfortunatly, the BottomToolbar (Chrome Duet feature) doesn't recognize
the opened accessory sheet as a keyboard and reserves space for bottom
controls that don't exist.

This will change when the way keyboards are detected is reworked in
crrev.com/c/1286426 but until this and its ancestor lands, the effects
of the accessory on the bottom controls are reintroduces with this CL.

Bug: 894747
Change-Id: I0467d10700c597cfe5fbf8a6463b220268ad6160
Reviewed-on: https://chromium-review.googlesource.com/c/1288592Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Friedrich Horschig [CEST] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600738}

chrome/android/java/src/org/chromium/chrome/browser/autofill/keyboard_accessory/ManualFillingMediator.java

@@ -47,6 +47,7 @@ class ManualFillingMediator
             this::onKeyboardVisibilityChanged;
     private Supplier<InsetObserverView> mInsetObserverViewSupplier;
     private boolean mShouldShow = false;
+    private @Px int mPreviousControlHeight; // TODO(fhorschig): Remove after crrev.com/c/1286426.
     private final KeyboardExtensionSizeManager mKeyboardExtensionSizeManager =
             new KeyboardExtensionSizeManager();
 
@@ -159,6 +160,7 @@ class ManualFillingMediator
             @Override
             public void didSelectTab(Tab tab, @TabModel.TabSelectionType int type, int lastId) {
                 mActiveBrowserTab = tab;
+                mPreviousControlHeight = mActivity.getFullscreenManager().getBottomControlsHeight();
                 restoreCachedState(tab);
             }
 
@@ -284,6 +286,8 @@ class ManualFillingMediator
         }
         mKeyboardAccessory.requestShowing();
         mKeyboardExtensionSizeManager.setKeyboardExtensionHeight(calculateAccessoryBarHeight());
+        // TODO(fhorschig): Remove after crrev.com/c/1286426:
+        mActivity.getFullscreenManager().setBottomControlsHeight(0);
         mKeyboardAccessory.closeActiveTab();
         updateInfobarState(true);
         mKeyboardAccessory.setBottomOffset(0);
@@ -315,6 +319,7 @@ class ManualFillingMediator
         if (mWindowAndroid.getKeyboardDelegate().isKeyboardShowing(mActivity, contentView)) {
             return; // If the keyboard is showing or is starting to show, the sheet closes gently.
         }
+        mActivity.getFullscreenManager().setBottomControlsHeight(mPreviousControlHeight);
         mKeyboardExtensionSizeManager.setKeyboardExtensionHeight(0);
         mKeyboardAccessory.closeActiveTab();
         updateInfobarState(false);
@@ -349,6 +354,8 @@ class ManualFillingMediator
         mKeyboardAccessory.setBottomOffset(newControlsOffset);
         mKeyboardExtensionSizeManager.setKeyboardExtensionHeight(
                 mKeyboardAccessory.isShown() ? newControlsHeight : 0);
+        mActivity.getFullscreenManager().setBottomControlsHeight(
+                mKeyboardAccessory.isShown() ? 0 : mPreviousControlHeight);
         mActivity.getFullscreenManager().updateViewportSize();
     }