cc: Free gpu resources when we are invisible or TM is oom.

cc/resources/gpu_rasterizer.cc

Index: cc/resources/gpu_rasterizer.cc
diff --git a/cc/resources/gpu_rasterizer.cc b/cc/resources/gpu_rasterizer.cc
index d810386da94a2c9ff36475e59590e2d79ed92787..a37c37b2742920d1153c45a75327d61e5db4783a 100644
--- a/cc/resources/gpu_rasterizer.cc
+++ b/cc/resources/gpu_rasterizer.cc
@@ -24,6 +24,17 @@
 #include "third_party/skia/include/core/SkSurface.h"
 #include "third_party/skia/include/gpu/GrContext.h"
 
+namespace {
+// The limit of the number of GPU resources we hold in the GrContext's
+// GPU cache.
+const int kMaxGaneshResourceCacheCount = 2048;
+
+// The limit of the bytes allocated toward GPU resources in the GrContext's
+// GPU cache.
+const size_t kMaxGaneshResourceCacheBytes = 96 * 1024 * 1024;
+
+}  // namespace
+
 namespace cc {
 
 // static
@@ -46,7 +57,26 @@ GpuRasterizer::GpuRasterizer(ContextProvider* context_provider,
     : resource_provider_(resource_provider),
       use_distance_field_text_(use_distance_field_text),
       threaded_gpu_rasterization_enabled_(threaded_gpu_rasterization_enabled),
-      msaa_sample_count_(msaa_sample_count) {
+      msaa_sample_count_(msaa_sample_count),
+      maxTextures_(kMaxGaneshResourceCacheCount),
+      maxTextureBytes_(kMaxGaneshResourceCacheBytes),
+      cache_cleared_(false) {
+  ContextProvider* worker_context_provider =

[vmiura, 2015/04/02 19:12:34]

As this is in three places, please refactor the code for setting cache limits to
a single method.

[sohanjg, 2015/04/08 09:00:31]

Done.

+      resource_provider_->output_surface()->worker_context_provider();
+
+  // The context lock must be held while accessing the context on a
+  // worker thread.
+  base::AutoLock context_lock(*worker_context_provider->GetLock());
+
+  // Allow context to bind to current thread.
+  worker_context_provider->DetachFromThread();
+
+  GrContext* gr_context = worker_context_provider->GrContext();
+  if (gr_context)
+    gr_context->setResourceCacheLimits(maxTextures_, maxTextureBytes_);
+
+  // Allow context to bind to other threads.
+  worker_context_provider->DetachFromThread();
 }
 
 GpuRasterizer::~GpuRasterizer() {
@@ -201,4 +231,48 @@ void GpuRasterizer::AddToMultiPictureDraw(const Tile* tile,
   multi_picture_draw_.add(sk_surface->getCanvas(), picture.get());
 }
 
+void GpuRasterizer::SetZeroMemoryLimit() {
+  ContextProvider* context_provider =
+      resource_provider()->output_surface()->worker_context_provider();
+
+  // The context lock must be held while accessing the context on a
+  // worker thread.
+  base::AutoLock context_lock(*context_provider->GetLock());
+
+  // Allow context to bind to current thread.
+  context_provider->DetachFromThread();
+
+  // Clear resource cache.
+  GrContext* gr_context = context_provider->GrContext();
+  DCHECK(gr_context);
+  gr_context->setResourceCacheLimits(0, 0);
+
+  // Allow context to bind to other threads.
+  context_provider->DetachFromThread();
+  cache_cleared_ = true;
+}
+
+void GpuRasterizer::SetDefaultMemoryLimit() {
+  if (!cache_cleared_)
+    return;
+
+  ContextProvider* context_provider =
+      resource_provider()->output_surface()->worker_context_provider();
+
+  // The context lock must be held while accessing the context on a
+  // worker thread.
+  base::AutoLock context_lock(*context_provider->GetLock());
+
+  // Allow context to bind to current thread.
+  context_provider->DetachFromThread();
+
+  // Restore resource cache.
+  GrContext* gr_context = context_provider->GrContext();
+  DCHECK(gr_context);
+  gr_context->setResourceCacheLimits(maxTextures_, maxTextureBytes_);
+
+  // Allow context to bind to other threads.
+  context_provider->DetachFromThread();
+}
+
 }  // namespace cc