GpuMemoryBuffers: Add an IsInUse function

Add a function GpuMemoryBuffer::IsInUseByWindowServer to see if a
resource is currently in use by the system. This will only return true
on Mac, where it returns the result of IOSurfaceIsInUse.

Hook this up to cc::ResourceProvider::CanLockForWrite and
InUseByConsumer. These fix the bug where tiles would flicker during
reuse.

BUG=558701
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1527483003

Cr-Commit-Position: refs/heads/master@{#368718}

1 files changed, 17 insertions, 1 deletions

diff --git a/cc/test/test_gpu_memory_buffer_manager.cc b/cc/test/test_gpu_memory_buffer_manager.cc
index e1e6e89..a540e32 100644
--- a/cc/test/test_gpu_memory_buffer_manager.cc
+++ b/cc/test/test_gpu_memory_buffer_manager.cc
@@ -27,7 +27,8 @@ class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
         shared_memory_(std::move(shared_memory)),
         offset_(offset),
         stride_(stride),
-        mapped_(false) {}
+        mapped_(false),
+        is_in_use_by_window_server_(false) {}
 
   // Overridden from gfx::GpuMemoryBuffer:
   bool Map() override {
@@ -50,6 +51,9 @@ class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
     shared_memory_->Unmap();
     mapped_ = false;
   }
+  bool IsInUseByMacOSWindowServer() const override {
+    return is_in_use_by_window_server_;
+  }
   gfx::Size GetSize() const override { return size_; }
   gfx::BufferFormat GetFormat() const override { return format_; }
   int stride(size_t plane) const override {
@@ -73,6 +77,10 @@ class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
     return reinterpret_cast<ClientBuffer>(this);
   }
 
+  void SetIsInUseByMacOSWindowServer(bool value) {
+    is_in_use_by_window_server_ = value;
+  }
+
  private:
   const gfx::Size size_;
   gfx::BufferFormat format_;
@@ -80,6 +88,7 @@ class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
   size_t offset_;
   size_t stride_;
   bool mapped_;
+  bool is_in_use_by_window_server_;
 };
 
 }  // namespace
@@ -90,6 +99,13 @@ TestGpuMemoryBufferManager::TestGpuMemoryBufferManager() {
 TestGpuMemoryBufferManager::~TestGpuMemoryBufferManager() {
 }
 
+void TestGpuMemoryBufferManager::SetGpuMemoryBufferIsInUseByMacOSWindowServer(
+    gfx::GpuMemoryBuffer* gpu_memory_buffer,
+    bool in_use) {
+  static_cast<GpuMemoryBufferImpl*>(gpu_memory_buffer)
+      ->SetIsInUseByMacOSWindowServer(in_use);
+}
+
 scoped_ptr<gfx::GpuMemoryBuffer>
 TestGpuMemoryBufferManager::AllocateGpuMemoryBuffer(const gfx::Size& size,
                                                     gfx::BufferFormat format,