Revert "[fuchsia] Convert Gfx PlatformView to use modern TouchSource API (#35018)" This reverts commit 25e8021c91e4c4f3805f6fa635868d4dca1e29f0.

diff --git a/shell/platform/fuchsia/flutter/engine.cc b/shell/platform/fuchsia/flutter/engine.cc
index 1d491d3..ab94955 100644
--- a/shell/platform/fuchsia/flutter/engine.cc
+++ b/shell/platform/fuchsia/flutter/engine.cc

@@ -166,8 +166,8 @@
   } else {
     gfx_protocols.set_view_focuser(focuser.NewRequest());
     gfx_protocols.set_view_ref_focused(view_ref_focused.NewRequest());
-    gfx_protocols.set_touch_source(touch_source.NewRequest());
-    // GFX used only on products without a mouse.
+    // TODO(fxbug.dev/85125): Enable TouchSource for GFX.
+    // gfx_protocols.set_touch_source(touch_source.NewRequest());
   }
   scenic->CreateSessionT(std::move(gfx_protocols), [] {});
 

diff --git a/shell/platform/fuchsia/flutter/platform_view.cc b/shell/platform/fuchsia/flutter/platform_view.cc
index 85d671c..6ae402b 100644
--- a/shell/platform/fuchsia/flutter/platform_view.cc
+++ b/shell/platform/fuchsia/flutter/platform_view.cc

@@ -109,31 +109,33 @@
   });
 
   // Begin watching for pointer events.
-  pointer_delegate_->WatchLoop([weak = weak_factory_.GetWeakPtr()](
-                                   std::vector<flutter::PointerData> events) {
-    if (!weak) {
-      FML_LOG(WARNING) << "PlatformView use-after-free attempted. Ignoring.";
-      return;
-    }
+  if (is_flatland) {  // TODO(fxbug.dev/85125): make unconditional
+    pointer_delegate_->WatchLoop([weak = weak_factory_.GetWeakPtr()](
+                                     std::vector<flutter::PointerData> events) {
+      if (!weak) {
+        FML_LOG(WARNING) << "PlatformView use-after-free attempted. Ignoring.";
+        return;
+      }
 
-    if (events.empty()) {
-      return;  // No work, bounce out.
-    }
+      if (events.size() == 0) {
+        return;  // No work, bounce out.
+      }
 
-    // If pixel ratio hasn't been set, use a default value of 1.
-    const float pixel_ratio = weak->view_pixel_ratio_.value_or(1.f);
-    auto packet = std::make_unique<flutter::PointerDataPacket>(events.size());
-    for (size_t i = 0; i < events.size(); ++i) {
-      auto& event = events[i];
-      // Translate logical to physical coordinates, as per
-      // flutter::PointerData contract. Done here because pixel ratio comes
-      // from the graphics API.
-      event.physical_x = event.physical_x * pixel_ratio;
-      event.physical_y = event.physical_y * pixel_ratio;
-      packet->SetPointerData(i, event);
-    }
-    weak->DispatchPointerDataPacket(std::move(packet));
-  });
+      // If pixel ratio hasn't been set, use a default value of 1.
+      const float pixel_ratio = weak->view_pixel_ratio_.value_or(1.f);
+      auto packet = std::make_unique<flutter::PointerDataPacket>(events.size());
+      for (size_t i = 0; i < events.size(); ++i) {
+        auto& event = events[i];
+        // Translate logical to physical coordinates, as per
+        // flutter::PointerData contract. Done here because pixel ratio comes
+        // from the graphics API.
+        event.physical_x = event.physical_x * pixel_ratio;
+        event.physical_y = event.physical_y * pixel_ratio;
+        packet->SetPointerData(i, event);
+      }
+      weak->DispatchPointerDataPacket(std::move(packet));
+    });
+  }
 
   // Configure the pointer injector delegate.
   pointer_injector_delegate_ = std::make_unique<PointerInjectorDelegate>(

diff --git a/shell/platform/fuchsia/flutter/platform_view_unittest.cc b/shell/platform/fuchsia/flutter/platform_view_unittest.cc
index 4f6a9cc..92c04c4 100644
--- a/shell/platform/fuchsia/flutter/platform_view_unittest.cc
+++ b/shell/platform/fuchsia/flutter/platform_view_unittest.cc

@@ -1396,7 +1396,8 @@
   EXPECT_EQ(expected_result_string, response->result_string);
 }
 
-TEST_F(PlatformViewTests, TouchSourceLogicalToPhysicalConversion) {
+// TODO(fxbug.dev/85125): Enable when GFX converts to TouchSource.
+TEST_F(PlatformViewTests, DISABLED_TouchSourceLogicalToPhysicalConversion) {
   constexpr std::array<std::array<float, 2>, 2> kRect = {{{0, 0}, {20, 20}}};
   constexpr std::array<float, 9> kIdentity = {1, 0, 0, 0, 1, 0, 0, 0, 1};
   constexpr fuchsia::ui::pointer::TouchInteractionId kIxnOne = {

diff --git a/shell/platform/fuchsia/flutter/pointer_delegate.cc b/shell/platform/fuchsia/flutter/pointer_delegate.cc
index 1977521..71cdb63 100644
--- a/shell/platform/fuchsia/flutter/pointer_delegate.cc
+++ b/shell/platform/fuchsia/flutter/pointer_delegate.cc

@@ -447,9 +447,7 @@
   // Start watching both channels.
   touch_source_->Watch(std::move(touch_responses_), /*copy*/ touch_responder_);
   touch_responses_.clear();
-  if (mouse_source_) {
-    mouse_source_->Watch(/*copy*/ mouse_responder_);
-  }
+  mouse_source_->Watch(/*copy*/ mouse_responder_);
 }
 
 }  // namespace flutter_runner